Hajime Kumagai's research while affiliated with Kyoto University and other places

Publications (86)

Article
Heart rate variability (HRV), heart beat-to-beat variations, is a measure of cardiac autonomic functions, and HRV monitoring using sensor technology can be a non-invasive way to assess stress of animals. The objective of this study was to investigate the effect of dietary vitamin A (VA) restriction to enhance beef quality on the physiological statu...
Article
We investigated the effects of supplementary calcium salt of fatty acid (CSFA) from linseed oil with different oil adsorbents on in vitro gas production and rumen fermentation characteristics in barley substrate condition. A non‐supplementation treatment (CONT) and treatments of six products, CSFA without oil adsorbent (2.1 fatty acid/Ca molar rati...
Article
This study aimed to determine the taxonomic and functional characteristics of the Japanese Black (JB) steer rumen microbiome. The rumen microbiomes of six JB steers (age 14.7 ± 1.44 months) and six JB sires × Holstein dams crossbred (F1) steers (age 11.1 ± 0.39 months), fed the same diet, were evaluated. Based on 16S rRNA gene sequencing, the beta...
Article
Although sex sorted sperm technology is commercially available in Japan, adoption of the technology has been limited in dairy farms due to high production cost, low conception rate and incomplete sexing accuracy. In this study, the base scenario with unsexed semen and four alternative scenarios were compared using a bio-economic and environment sim...
Article
Full-text available
Heart rate variability (HRV) is the heart beat-to-beat variation under control of the cardiovascular function of animals. Under stressed conditions, cardiac activity is generally regulated with an upregulated sympathetic tone and withdrawal of vagal tone; thus, HRV monitoring can be a non-invasive technique to assess stress level in animals especia...
Article
Full-text available
Efficient utilization of locally available feed resources is needed for further development of livestock productions in the tropics. However, an inadequate supply of nourish grass is common, and limited information exists regarding the chemical composition and digestibility of locally available feed resources in the different season. There were few...
Article
Evaluation of animal behavior provides information on health and well-being in animals. In this preliminary study, we investigated the effectiveness of an accelerometry approach to evaluate changes in health status of cattle by combining physical activity quantified by dynamic body acceleration (DBA) and qualitative behavioral classification data....
Article
Gum arabic (GA) has potential rumen modifier functions. This is the first study to investigate the in vitro ruminal fermentation characteristics of GA. Rumen fluid was collected from ruminal fistulated wethers; rolled barley and ryegrass straw were used as substrates for concentrate and forage conditions, respectively. Besides incubating with the s...
Article
Full-text available
Calcium salts of long-chain fatty acids (CSFA) from linseed oil have the potential to reduce methane (CH 4 ) production from ruminants; however, there is little information on the effect of supplementary CSFA on rumen microbiome as well as CH 4 production. The aim of the present study was to evaluate the effects of supplementary CSFA on ruminal fer...
Article
Wine lees are by-products of wine-manufacturing, but the usefulness as animal by-product feed has not yet been revealed. The present study was aimed to investigate the usability of wine lees as feed for ruminants in fattening conditions by in vitro and in vivo trials. In in vitro experiments (in vitro I and II), the following four treatments were p...
Article
Four Thai native bulls were used to evaluate the availability of mother liquor (ML), by‐product of monosodium glutamate, as a replacement of soybean meal (SBM) consisting of 10% in concentrate. The SBM was replaced by the ML at 0% (C), 20% (T1), 40% (T2), and 60% (T3), and the experiment was a randomized block design experiment. The animals were fe...
Article
Recent developments of small electronic instruments have enabled the classification of animal behavior using simultaneous measurements of various bio-logging data such as acceleration, magnetism, and angular velocity. Following technological progress, studies on the behavioral classification of ruminants combining measurements based on acceleromete...
Article
In Southwestern China, dairy farms utilized by-product feeds in dairy production and surplus calves were kept for producing beef as a by-product. However, it is unclear how the environmental impacts are in such dairy production system. This study evaluated, for the first time, the global warming potential (GWP), acidification potential (AP), eutrop...
Article
In recent years, livestock production has to ensure not only productivity and economics but also animal welfare. This review summarized the effects of animal welfare on beef productivity and the consumers’ demand in beef food chain based on European researches mainly. The management practices related with animal welfare can improve beef productivit...
Article
Variances caused by the differential expression of paternally and maternally imprinted genes controlling carcass traits in Japanese Black cattle were estimated in this study. Data on marbling score (BMS), carcass weight, rib thickness, rib‐eye area (REA) and subcutaneous fat thickness (SFT) were collected from a total of 13,115 feedlot steers and h...
Article
Full-text available
Livestock farming in Nepal, especially buffalo farming alone contributes a major share in livelihoods of farmers. Stall feeding of buffalo is common in Chitwan with occasional grazing. This raises questions about status of nutrients supplied to maintain productivity as feed resources varied in forest and crop land according to the season. A study w...
Article
The objective of this study was to evaluate the environmental impacts of the intensive dairy farms in Songming region in Yunnan Province in Southwestern China. A total of 36 dairy farms with utilization of by-product feeds and high fertilizer application were investigated in the study site. The life cycle assessment (LCA) methodology was used to qu...
Article
In vitro fermentation experiment and in vivo metabolic experiment were conducted to investigate the effects of sake lees made from steamed rice on digestion, ruminal fermentation, nitrogen balance and blood metabolites in wethers fed high concentrate diets. Rolled barley was replaced with soybean meal (SBM), dried sake lees (SLd) and wet sake lees...
Article
Mother liquor (ML) is monosodium glutamate by‐product and contains much crude protein (CP). The objective of this study was to investigate the effect of supplementation of two types of MLs having different chemical compositions on in vitro ruminal fermentation characteristics. ML1 had 74% organic matter (OM) and 70% CP and ML2 had 85% OM and 83% CP...
Article
Full-text available
Heart rate variability (HRV) analysis is a widely used technique to assess sympatho-vagal regulation in response to various internal or external stressors. However, HRV measurements under free-moving conditions are highly susceptible to subjects’ physical activity levels because physical activity alters energy metabolism, which inevitably modulates...
Article
The beef fattening production system in Japan typically uses a large amount of imported feed under housing management. Since this system has several economic and environmental problems, the grazing fattening system using Japanese Brown cattle (a local breed which is thought to be suitable for grazing system) has recently been receiving attention. H...
Article
Full-text available
Thirty farms that raised Lime or Parkote female buffaloes in Kaski were selected for the survey of animal census, feeding traits and body dimensions in the rainy season and the dry season. The average number per farm was 0.76 in Lime and 0.27 in Parkote. The average of age and parity was 8.2 years old and 4.4 in Lime, and 6.6 years old and 2.8 in P...
Article
Full-text available
The sizes of body parts often co-vary through exponential scaling, known as allometry. The evolution of allometry is central to the generation of morphological diversity. To make inferences regarding the evolved responses in allometry to natural and artificial selection, we compared allometric parameters (slope and intercept) among seven species an...
Article
Four Thai native cattle were used in a 4 × 4 Latin square design experiment to evaluate the availability of desalted mother liquor (DML) as replacement of salt in concentrate. Each cattle was assigned to one of the following concentrate feeding treatments: C1, 1% NaCl was added as salt; C2, 2% NaCl was added as salt; D1, 1% NaCl was replaced by DML...
Article
Full-text available
Four Thai native steers were used to determine the adequate levels of supplementary desalted mother liquor (DML) for energy and nitrogen balances and ruminal fermentation. The crude protein and sodium chloride contents of DML were 25.5% and 60.3% on a dry matter (DM) basis, respectively. A 4 × 4 Latin square design experiment was conducted by addin...
Article
The estimation of energy expenditure (EE) of grazing animals is of great importance for efficient animal management on pasture. In the present study, a method is proposed to estimate EE in grazing animals based on measurements of body acceleration of animals in combination with the conventional Agricultural and Food Research Council (AFRC) energy r...
Article
Full-text available
This study was conducted to determine the effects of mixtures of liquid brewer's yeast (LBY) and cassava pulp (CVP) with rice straw (RS) on feed intake, digestibility, rumen fermentation, and growth of dairy heifers. Sixteen Holstein crossbred heifers (13.8 ± 1.6 months old, 210 ± 23 kg body weight (BW)) were randomly allocated to four feeding trea...
Article
The objective of this study was to evaluate environmental impacts of a year-round-grazing fattening system in a subtropical region, Okinawa, Japan, using the life cycle assessment (LCA). The fattening system for Japanese Brown steers was an intensive rotational grazing with by-product feeds (brewers grain and broken rice) as total mixed rations (TM...
Article
Phragmites is a cosmopolitan perennial emergent macrophyte that is distributed worldwide. In recent years, Phragmites has attracted attention for its potential use as roughage. Given the increasing demand for feed and the number of constructed wetlands (CWs) vegetated with Phragmites, Phragmites is expected to play an important role in roughage pro...
Article
The improvement of farm animal welfare through management practices has become important despite the fact that there is a conflict between animal welfare and production efficiency. It may be possible to find associations between production and management practices related to animal welfare, such as management strategies to enhance both production a...
Article
Biochemical values and mineral concentrations in blood plasma were investigated to evaluate the statuses of health and mineral nutrition among yaks in Mustang District, Nepal. In total, 118 plasma samples of female yaks collected in April and September/October of 2013-2015 were offered. Seventy-four percent of yaks showed lower plasma total-cholest...
Article
We examined the in vitro fermentation characteristics and in situ dry matter (DM) and crude protein (CP) degradability of tamarind kernel powder extract residue (TKPER), a by-product of polysaccharides thickener processing. Two types of TKPER (I and II), of which the CP and neutral detergent fiber organic matter basis contents (%) were 41.4 and 42....
Article
This study aimed to evaluate the effect of liquid brewer's yeast (LBY) addition on chemical composition and fermentation quality of mixture of LBY and cassava pulp (CVP) with rice straw (RS) in different ratios during preservation periods. Four mixtures of LBY, CVP and RS were made, that is mixture ratio of LBY : CVP : RS of 0% LBY, 20% LBY, 35% LB...
Article
Full-text available
Objective: This study aims to evaluate the chemical composition, fermentation quality and in vitro ruminal fermentation of various ratios and storage periods of liquid brewer's yeast (LBY) mixed with cassava pulp (CVP). Methods: Four mixtures of fresh LBY and CVP were made (LBY0, LBY10, LBY20, and LBY30 for LBY:CVP at 0:100, 10:90, 20:80, and 30...
Article
Full-text available
Objective This study was to examine in vivo digestibility, nitrogen balance and ruminal fermentation of tamarind (Tamarind indica) kernel powder extract residue (TKPER) compared to soybean products and by-products in wethers. Methods Four wethers with initial body weight (BW) of 51.6±5.5 kg were assigned in a 4×4 Latin square design to investigate...
Article
The objectives of this study were to evaluate the environmental and economic impacts of year-round-grazing systems and a conventional housing system for Japanese Brown fattening steers by the life cycle assessment (LCA) method. Four treatments were designed in this study; grazing fattening without feed rice (G group), grazing fattening with feed ri...
Article
Full-text available
Livestock is an integral part for the most rural livelihoods in Nepal. A very high proportion of poor and marginalized farmers depend on livestock as main or supplemental resources for their income. Cattle and buffalo contribute to more than 70% of the livestock sector. The Lime, Parkote and Gaddi are the indigenous buffalo breeds of Nepal. The pro...
Article
In recent decades, constructed wetlands dominated by common reeds [Phragmites australis (CAV.) Trin. ex Steudel] have been utilized for treating nitrogen-rich wastewaters. Although plant harvest is a vegetation management in constructed wetlands for the purpose of improving nutrient removal, harvested biomass has become a problem in many places. Th...
Article
This study was conducted to determine the effects of dietary soybean curd residue (SCR) and soy sauce cake (SSC) on the growth performance, carcass traits and physiochemical and intramuscular fatty acid (FA) characteristics in Japanese Black steers. Ten steers (29.7 ± 0.3 months old, 856.6 ± 24.4 kg body weight) were assigned to either treatment C,...
Conference Paper
This study was commissioned to assess the feeding traits, reproductive and production systems, and trading and slaughter as meat resources of goat in mid hills of Nepal. A total of 120 goat farms from Kaski, Tanahun and Palpa districts of Nepal were visited and each farm was interviewed using a structured questionnaire. The livestock raising integr...
Article
The objectives of this study were to estimate and evaluate potassium (K) and magnesium (Mg) budgets and flows of animal production in the basin of Dianchi Lake, China. Feed sampling and farmer interviews were conducted in field surveys. The supplies of K and Mg from local and external feeds and the retention, production and excretion of animals wer...
Poster
Full-text available
Recently, constructed wetlands (CWs) dominated by common reed [Phragmites australis (CAV.) Trin. ex Steudel] have increased for treating wastewaters in China. The biomass waste became a serious issue of management of CWs. The purpose of this work was to identify a potential use of common reed as roughage for ruminants in southwest China. Potential...
Article
The average annual increment of goat populations in Nepal was 3.17% during the last decade (1999-2009). As meat of goat is accepted by most ethnic groups, this species is remarkable for meat production in the country. Chitwan district is a low-altitude in southern plain region of Nepal. The livestock raising integrated with crop production is prefe...
Article
Full-text available
The factors influencing the priority of access to food and the effects of the priority of access to food on their carcass traits were analyzed for Japanese Black (Wagyu) cattle in a semi-intensive fattening production system. The records of 96 clinically healthy steers and heifers were analyzed. The calves at ∼3 to 4 months of age were allocated to...
Article
Full-text available
Estimating the energy expenditure of farm animals at pasture is important for efficient animal management. In recent years, an alternative technique for estimating energy expenditure by measuring body acceleration has been widely performed in wildlife and human studies, but the availability of the technique in farm animals has not yet been examined...
Article
We assessed the nitrogen (N) and phosphorus (P) flows in intensified livestock production systems by investigating nutrient budgets and cycling in the basin of Dianchi Lake, one of the most eutrophic lakes in China. We conducted field surveys based on feed samplings and interviews of livestock farmers. The N and P in local and external feeds, anima...
Article
Full-text available
To investigate the effects of total mixed ration (TMR) silage, which contained brewers grain and rice straw as a substitute for conventional concentrate on feed intake and milk production in middle-to-late lactation buffaloes, four multiparous Murrah buffaloes were assigned to a 3 × 3 Latin square design experiment. The TMR silage, which had higher...
Article
Four wethers were used in a 4 × 4 Latin square design experiment to evaluate the availability of two types of winery wastes, winery sediment and grape pomace, as ruminant feeds possessing antioxidant activities. Each wether was assigned to one of the following four treatments: (i) 75 g/kg winery sediment (WS) on a dry matter (DM) basis; (ii) 166 g/...
Article
The objectives of this study were to evaluate and compare the environmental impacts and feed costs of two beef-fattening experiments using linseed oil soap fatty acids (LS) by the life cycle assessment (LCA) method. Crossbred heifers between Japanese Black sires and Holstein dams were used for two fattening experiments. In the first experiment, thr...
Article
Four wethers were used in a 4 × 4 Latin square design experiment to evaluate in vivo digestibility of total mixed ration (TMR) silage with food by-products for dairy cows, and the ruminal condition and nitrogen (N) balance were examined. Five by-products (i.e. potato waste, noodle waste, soybean curd residue, soy sauce cake and green tea waste) wer...
Article
Full-text available
Consumption of buffalo milk has been increasing in Nepal. Thus, further development of dairy buffalo is required for efficient production. However, the changes of milk production and reproductive performance of buffaloes in the country remain obscure. Hence, the study is conducted for identifying the dairy production and reproduction of buffaloes r...
Article
The objective of this study was to develop equations to predict carcass tissue weights and percentages and boneless carcass non-trimmed cut weights by using the cold carcass weight (CCW) and three other traits at the 6-7th rib section, which are routinely collected in carcass markets in Japan. Carcasses from 94 Japanese Black steers were used for t...
Article
Three types of bamboo pellets as a ruminant feed: P1 (ground bamboo (GB) cultured with the fungus Ceriporiopsis subvermispora (CGB) : soybean curd residue (T) : soy sauce cake (S) in a 5:4:1 ratio on a dry matter (DM) basis); P2 (GB : T : S = 5:4:1 on a DM basis); and P3 (CGB : T : S = 5.5:0.8:3.7 on a DM basis) were prepared. Four wethers were ass...
Article
Consumption of buffalo milk has been increasing in Nepal. Thus, further development of dairy buffalo is required for efficient production. However, the transition of milk production and reproduction of buffaloes in the country remains obscure. Hence, the study is conducted for identifying the changes of dairy production and reproduction of the anim...
Article
Four wethers were used in a 4 × 4 Latin square design experiment to evaluate the applicability of two types of total mixed ration (TMR) silage with food by-products. Four food by-products (i.e., potato waste, soy sauce cake, soybean curd residue and noodle waste) were obtained and mixed with commercial concentrate (CC) as TMR silage. The two types...
Article
A pilot study was conducted to evaluate the suitability of stable isotope analysis for inferring the feeding histories of cattle fed known feeds. Stable isotope ratios of carbon and nitrogen (δ13C and δ15N) were measured in meat and hair from cattle and in their feeds at five farms in different regions of Japan, and the correlations of the isotope...
Article
An experiment was conducted using 17 male buffalo calves to assess the effects of plane of nutrition on slaughtering traits and meat characteristics. To attain 250 kg body weight (BW), the calves were allocated into three groups: high (H), low-high (L-H) and low (L) corresponding to concentrate levels receiving the concentrate at 1.50% of BW, 0.75%...
Article
An experiment was conducted using 17 male buffalo calves to assess the effects of plane of nutrition on dry matter intake (DMI), daily gain (DG), body size measurement, apparent digestibility and nitrogen (N) balance. To attain 250kg BW, the calves were allocated into three groups: H, L-H and L, receiving the concentrate at 1.50% of BW, 0.75% of BW...
Article
Economic and environmental impacts of different amounts of calcium soaps of linseed oil fatty acids (LOFA) supplementation on beef fattening systems were evaluated based on a life cycle assessment and a linear programming method. Optimization for 7 types of rations containing 0.0, 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0% of LOFA at a dry matter basis were...
Article
A simplified ration optimization method was applied to a beef cattle fattening system to evaluate the utilization of food by-products under various situations. The method was extended to reduce feed costs (i.e., economic factors) and nitrogen and phosphorus excretions (i.e., environmental factors) by introducing penalty coefficients of nitrogen and...
Article
トールフェスクと圧ぺん大麦を各々粗飼料および濃厚飼料基質とする条件下でのグアノシン(GR)およびイノシン(HxR)の投与効果を調べるため,第一胃内の発酵モデルとしてin vitro法を用いて検討した.添加物量は,尿素窒素当量で40 mLの培養液に対し各々4, 16および64 mgとした.48時間でのin vitroガス発生量は,両基質条件でGRおよびHxR添加で尿素添加に比べて高かった(P < 0.05).in vitro DM消化率は,粗飼料基質条件では64 mgのGRおよびHxR添加で尿素添加よりも高くなったが(P < 0.05),濃厚飼料基質条件では差はみられなかった.総VFA濃度は,粗飼料基質条件で64 mgのGR添加で尿素添加よりも高かったが(P < 0.05),濃厚飼料基質条件で...
Article
Cattle grazing in abandoned fields has recently been of great importance in promoting effective utilization of local resources in Japan. The objectives of this study were to investigate spatial distributions of grazing cattle in abandoned fields and to analyze relationships between the patterns of spatial distribution and energy expenditure (EE) of...
Article
The bodyweight (BW), body length (BL), withers height (WH), criss-cross height (CH), heart girth (HG) and hip width (HW) in the total 143 head of growing buffaloes raised by a large-scale farm (LF) in Kaski and small-scale farms (SF) in Chitwan were measured for presenting the growth differences of the buffaloes in Nepal. The development of the bod...
Article
To identify the effects of whole crop maize silage (MS) as a substitute for rice straw (RS) on feed intake and milk production of mid-late lactating buffalo and cattle in Tarai, Nepal, eight Murrah and eight Jersey-Hariana were fed the basal diet, RS (ad libitum) with concentrate (0.68% of bodyweight [BW] on a dry matter [DM] basis). A 4 x 4 Latin...
Article
The objective of this study was to quantify nitrogen (N), phosphorus (P) and potassium (K) utilization and their cycling in a beef-forage production system. A survey was conducted at the Kyoto University experimental farm in Kyoto Prefecture, Japan, and included 9.5 ha of meadow and about 160 head of beef cattle. Forages cultivated on the meadow we...
Article
The objective of the present study was to apply two methods developed in ecology, the cycling index and input-output environs, to interpret nutrient flows in mixed rice-beef production systems. The cycling index (CI) was a quantitative measure of nutrient cycling. It was defined as the proportion of cycled nutrients to the total amount of nutrient...
Article
A study was conducted to compare responses of nutrient intake, digestibility, ruminal fermentation, and N balance in goats fed high amounts of concentrate supplemented with inosine or urea. Four Japanese Saneen goats (49.2 ± 5 kg), housed in individual metabolic cages, were blocked by weight into two pairs, and assigned inosine or urea as non-prote...