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Jose Alfonso Abecia

Jose Alfonso Abecia
Instituto Universitario de Investigación en Ciencias Ambientales de Aragón. Universidad de Zaragoza

Full professor. PhD Dip ECSRHM

About

356
Publications
69,089
Reads
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3,635
Citations
Additional affiliations
December 2010 - present
University of Zaragoza
Position
  • Professor (Full)
January 1995 - December 2012
University of Zaragoza
September 1992 - December 1993
Macaulay Land Use Research Institute
Education
May 2020 - December 2020
European College Small Ruminant Health Management
Field of study
  • Small ruminant health management
October 1988 - April 1992
University of Zaragoza
Field of study
  • Animal Production
September 1983 - June 1988
University of Zaragoza
Field of study
  • Veterinary Science

Publications

Publications (356)
Conference Paper
Full-text available
In the last few years, a new approach which claims the use of ‘biostimulation’ (i.e., the stimulatory effects on reproductive characteristics of females, e.g., onset of puberty, oestrous expression, ovulation induction, that are induced by presence of a male) in place of exogenous hormones and drugs to control and improve the productivity of sheep...
Conference Paper
In order to compare locomotor activity (ACT) of lambs reared or not by their mothers, during their first week of life, 16 lambs (8 twin pairs; 8 males, 8 females) were fitted with an accelerometer (ActiGraph wGT3X-BT; ActiGraph, Pensacola, USA) (46×33×15 mm in size, weight 19 g), 24 hours after birth, attached on a neck collar. Lambs were divided i...
Conference Paper
A flock of 3,000 heads of Merino de los Montes Universales sheep practices a 23-d transhumance (Tr) in Nov. The flock walks from its home summer mountains in the north, to the winter pastures, in southern Spain (350 km). Seven days before the Tr, two ewes received a surgically implanted subcutaneous bio-logger (DST milli-HRT, Star Oddi, Iceland) (1...
Conference Paper
The objective of this study was to evaluate the effects of melatonin implants in pregnant Rasa Aragonesa ewes on birthweight (BW), liveweight (LW), average daily gain (ADG) and passive immunity transfer of female and male lambs under housed conditions. Pregnant ewes were implanted with subcutaneous melatonin (18 mg, Melovine, CEVA, Spain) at fourth...
Conference Paper
Insects are emerging as a sustainable alternative for poultry feed to the current monopoly of soybean. Therefore, the objective of this study was to assess the development of slow-growing chicks fed Acheta domesticus meal as a total replacement for soybean meal during the first 4 weeks of life, using isoproteic and isoenergetic diets. A total of 12...
Conference Paper
Polyunsaturated fatty acids (PUFA) are well known for their beneficial role in different body systems and their function in mammals. Their use as feed additive has been investigated with the aim of improving the reproductive and productive performance in different livestock species but their impact on fertility in dairy sheep is scarcely documented...
Article
Full-text available
Eight stimulating rams, and twelve stimulated rams, were used to determine whether a similar endocrine response to the introduction of sexually active males in spring in a flock of ewes is observed in a flock of rams. The stimulating rams (n = 4) were induced into a sexually active state by exposure to 2 months of long days (16 h light/d) (15 Decem...
Article
Full-text available
To determine the effect of the combination of melatonin implants and prostaglandin (PG) F2α on reproductive performance in the late breeding season (Dec at the northern hemisphere), 500 Lacaune ewes were divided into four groups. On day 0 (7 Nov), 150 ewes were treated with a melatonin (M) implant. From that group, 64 ewes (M + 1PGF group) were inj...
Article
Twenty-two lambs were used to determine their locomotor activity during lactation, and its circadian rhythm, based on data collected by actigraphy; the relationships among lambs were also measured calculating their proximity and distance. Lambs were fitted with Bluetooth-enabled (BT) accelerometers during weeks 1 and 4 of age, and data were downloa...
Article
Full-text available
Hormonal treatments used in the artificial insemination (AI) of sheep can cause several physiological problems that can affect negatively fertility and animal health; however, AI protocols based on the detection of natural estrus offer a more sustainable option and can achieve high fertility. In this study, an AI protocol at natural estrus in organ...
Technical Report
Full-text available
INNOVACIÓN MUNDO GANADERO Mayo / Junio 2022 36 En los últimos años, las geotecnologías, y concretamente la monitorización por GNSS (Global Navigation Satellite System), se ha instalado en las rutinas de la ganadería extensiva, ya que permite seguir remotamente a los animales en todo momento. Yendo un paso más allá, esos datos permiten analizar los...
Technical Report
Full-text available
Resumen Abstract ¿Es eficaz el sistema PRV para la oveja castellana? El Sistema de Pastoreo Racional de Voisin (PRV) es una técnica agroeco-lógica que utiliza cargas ganaderas muy altas en periodos de tiempo cortos para mejorar las propiedades del suelo; sin embargo, hay poca evidencia que demuestre que los animales bajo este sistema puedan satisfa...
Conference Paper
Full-text available
BACKGROUND-AIM Melatonin is the hormone that regulates sheep seasonality and is usually used in subcutaneous implants in rams to counteract the effects of the non-reproductive season. Melatonin is also present in plants (phytomelatonin). Therefore, phytomelatonin-rich diets could be a green alternative for enhancing reproductive parameters in rams....
Conference Paper
BACKGROUND-AIM In seasonal anestrous goats, the introduction of a buck stimulates LH secretion and triggers ovulation, a phenomenon called “the male effect”. The sexual and endocrine responses of females to the male effect varies with the sexual behavior displayed by bucks. Bucks rendered sexually active during the sexual rest by previous exposure...
Conference Paper
Full-text available
BACKGROUND-AIM The ram effect, which is the most well-studied socio-sexual factor for inducing ovulation in sheep during the seasonal anestrus, involves the reintroduction of males to a flock of ewes in anestrus that had been isolated from rams. The introduction of the rams induces an increase in the tonic secretion of LH of the females, and a prop...
Conference Paper
Full-text available
BACKGROUND-AIM Undernutrition is able to modulate uterine physiology and gene expression. This could be achieved by inducing epigenetic changes, such as DNA methylation, since a lesser supply of precursors for the methionine/folate cycles, which provide methyl donors in cells, could lead to altered DNA methylation. The aim of this study was to asse...
Conference Paper
Full-text available
BACKGROUND-AIM It is well known that the quality and composition of the diet can influence reproductive performances in farm animals and contribute to reduce the reproductive failure during early stage of pregnancy. Thus, the aim of the present study was to assess the effect of dietary supplementation with by-pass α-linolenic acid (ALA) on ovarian...
Conference Paper
Full-text available
BACKGROUND-AIM Polyunsaturated fatty acids are well known for their antioxidative properties. This effect could be positive on maternal environment during embryo maternal recognition phase. Thus, the present study evaluated the effect of dietary supplementation with by-pass α-linolenic acid (ALA) on luteal, uterine and plasmatic oxidative status at...
Conference Paper
Full-text available
BACKGROUND-AIM Our aim was to study the effect of undernutrition on liver gene expression and its association with the endocrine and uterine milieu in ewes with different body condition score at the beginning of the experiment (BCSi). METHODS In the University of Zaragoza, Spain during the breeding season, 36 multiparous-5 years old Rasa Aragonesa...
Article
Full-text available
This study aimed to investigate whether a specific genotype of the MTNR1A gene influences social dominance and reproductive performance in rams. Thirty-one rams were genotyped for Rsal and Mnll polymorphism of the gene: CC (n=19), CT (n=5), and TT (n=7), and GG (n=20), GA (n=6), or AA (n=5), respectively. Maintenance (standing still, lying down, dr...
Article
Male goats rendered sexually active by exposure to a photoperiodic treatment are more efficient than untreated goats in stimulating LH secretion and ovulation in seasonally anestrous goats. This phenomenon is called the "male effect". Here, we determined whether sexually active bucks are able to stimulate the endocrine and sexual activities of othe...
Article
Full-text available
The effects of exogenous melatonin implanted before lambing on the quality of colostrum and milk yield were quantified in 715 ewes. Forty days before lambing, 246 ewes (1M) received a melatonin implant; another 137 ewes (2M) received two implants, and the remaining 332 ewes (C) did not receive an implant (control). Milk analysis was based on indivi...
Article
Full-text available
GPS collars are a technology that is used extensively to monitor livestock due to its versatility. In this study, the main objective was to confirm whether it can detect the circadian rhythmicity that modulates the behavior of free-grazing sheep. The Churra-breed flock that was monitored grazed an approx. 166-ha fenced area within a dehesa ecosyste...
Conference Paper
Full-text available
En la avicultura ecológica de carne, parte de la crianza de los animales tiene lugar al aire libre. El objetivo de este estudio fue evaluar como afecta la temperatura y el Índice de TemperaturaHumedad (THI) a los consumos de pienso y agua e índice de conversión registrados semanalmente, en pollos de engorde en alojamientos con acceso al exterior. S...
Conference Paper
Full-text available
La producción de pollos de crecimiento lento está aumentando y con ello las diferentes líneas utilizadas, implicando mayores estudios sobre los parámetros productivos y conformacionales de los animales. El objetivo de este estudio fue la evaluación del peso y la conformación corporal empleando diferentes estirpes de pollos de engorde. Un total de 6...
Article
Full-text available
The aim of this work was to determine the effects of undernutrition on gene expression in liver and adipose tissue, and on the hepatic concentration of insulin like growth factor 1 (IGF1) and insulin, in pregnant ewes with different initial body condition score (iBCS). Thirty-six Rasa Aragonesa ewes were divided into 2 groups with different BCS: BC...
Technical Report
Full-text available
Los cambios en la temperatura corporal (T). la frecuencia cardíaca (FC) y el nivel de actividad (ACT ). de los animales. así como el estudio de sus ritmos circadianos, son herramientas muy útiles para determinar el grado de estrés de nuestros animales. ya que los cambios en el horario de alimentación, los alojamientos o las relaciones sociales entr...
Article
Full-text available
Thirty Merino rams were used to determine the effect of four management systems of rams on semen quality during the anestrous season. Animals were divided into four groups: Artificial‐Photoperiod group (AP; n=8), which were isolated from females and exposed to artificial long days (16 h/d) from 1st Feb to 15th Mar; Natural‐Photoperiod (NP; n=8), is...
Article
Environmental factors affect daily milk production in dairy animals. The aim of this study was to quantify the effects of environmental factors, specifically mean temperature (°C), relative humidity (%), temperature-humidity index (THI), solar radiation (°), pluvial precipitation (mm) and lunar calendar (full moon, waxing quarter, waning quarter, n...
Article
Full-text available
Insect larval meal is an increasingly common protein source in poultry systems. In this study, the effect of replacing soybean meal with Tenebrio molitor larval meal on the performance of slow-growing chickens was assessed. A total of 128 one-day-old chickens (Colorield) were randomly divided into a control group (C) (n = 64), fed with soybean meal...
Article
Traditional knowledge about the behavior of grazing livestock is about to disappear. Shepherds well know that sheep behavior follows non-random patterns. As a novel alternative to seeking behavioral patterns, this study quantified the grazing activities of two sheep flocks of Churra breed (both in the same area but separated by 10 years) based on G...
Chapter
Las sociedades modernas demandan alimentos producidos con sistemas cada vez más sostenibles con el medio ambiente y con el bien estar de los animales. Por ello esta publicación aborda la situación de las granjas avícolas diferenciadas y certificadas con producciones más sostenibles que la producción industrial, explicando los sistemas de producción...
Article
Subcutaneous bio-loggers were used to monitor the temperature (T), heart rate (HR), and activity (ACT) of eight ewes managed under intensive housing conditions (permanent stabling and fed once per day). Animals were fed barley straw ad libitum and 0.45 kg concentrate per ewe once per day at 08:00 h. Ewes received a surgically implanted subcutaneous...
Article
Twenty-five ewe-lambs born in November were used to measure the effect of the presence of cyclic or non-cyclic adult ewes on the age at first fertile estrus. Lambs were weaned at 45 days of age and kept in a single flock until 3 Mar (4 months old), when they were assigned to one of the following three groups: Group CE (n = 8), housed with six cycli...
Article
Full-text available
Three experiments were designed to study the efects of melatonin implantation of ewes and lambs after lambing on the growth of lambs and milk quality throughout lactation. In experiment 1, 53 lambs either did (n =28) or did not (n =25) receive a subcutaneous 18-mg melatonin implant at the base of the left ear. In experiment 2, 55 lambs and their mo...
Article
Objectif À l’aide de la technologie GPS, nous tentons de déterminer si le comportement des moutons en pâturage libre s’adapte aux rythmes lumineux naturels. Méthodes L’étude s’est réalisé sur un troupeau de 650 moutons en pâturage libre sur une extension de 800 Ha. de pâturages communaux (41°24′23′́N - 6°15′38′́O) a Zamora. Des colliers avec un di...
Conference Paper
Objectives: to determine the circadian rhythmicity of temperature (T), heart rate (HR) and activity (ACT) of ewes housed under intensive conditions by the use of biologgers. Material and methods: The experiment was conducted at University of Zaragoza, Spain (41°N 0°W), in accordance with the Spanish Policy for Animal Protection (RD 53/2013). In mi...
Conference Paper
A virtual fence can be defined as a structure that serves as an enclosure, barrier or limit for livestock, but in the absence of a physical blockade and without the need for the presence of a nearby shepherd. The concept of virtual fencing is especially interesting due to its potential to improve the management of livestock in a sustainable and eco...
Conference Paper
La estacionalidad de la reproducción es una característica de la mayoría de las razas caprinas y ovinas de latitudes subtropicales. Las hembras presentan anovulación y disminución de las concentraciones plasmáticas de LH en primavera y verano, mientras que los machos disminuyen drásticamente los niveles plasmáticos de testosterona, la producción es...
Conference Paper
Full-text available
Objectif A l'aide de la technologie GPS, nous tentons de déterminer si le comportement des moutons en pâturage libre s'adapte aux rythmes lumineux naturels. Méthodes L´étude s´est réalisé sur un troupeau de 650 moutons en pâturage libre sur uneextensión de 800 Ha. de pâturages communaux (41º24´23´´N - 6º15´38´´O) a Zamora. Des colliers avec un disp...
Technical Report
Full-text available
En la segunda parte de este artículo se describe la concentración y volumen de semen óptimos para la utilización del dispositivo antirreflujo para la inseminación artificial ovina y la evaluación de parámetros no convencionales del semen de los machos donantes.
Conference Paper
Full-text available
In mid-May, 8 non-pregnant adult Rasa Aragonesa ewes (mean live weight (±S.D.) 50±2 kg), treated with intravaginal sponges (Sincropart, CEVA Salud Animal, Barcelona, Spain) for 12 days, were surgically implanted with a subcutaneous body temperature (BT, °C), heart rate (HR, beats per minute, bpm) and activity (ACT, mg, g=acceleration of gravity) bi...
Technical Report
Full-text available
En la primera parte de este artículo se describen los factores ambientales que afectan al éxito de la inseminación artificial con semen refrigerado y la influencia en este éxito de un nuevo dispositivo antirreflujo para la inseminación artificial ovina.
Conference Paper
Full-text available
Precision livestock farming is supported by devices to help farmers to track animal movements with GPS and accelerometers, or collect physiological data, such as temperature and heart rate. Based on data collection and algorithms, these devices can determine signals of oestrous, pregnancy or illness. The aim of this work was to determine circadian...
Conference Paper
Full-text available
Insects are an attractive alternative for animal feeding. The aim of this study was to assess the consumption preference of 50-day-old slow-growing Coloriel broilers fed Tenebrio molitor larvae flour for 7 days as the main protein source. 256 chicks were divided into two homogeneous groups based on animal size: the heaviest group (G) had a liveweig...
Conference Paper
Full-text available
Determine the actual day of lambing in extensive sheep systems, where ewes are in remote paddocks and cannot be individually monitored is an impossible task. With the help of Precision Livestock Farming, farmers can predict events such as parturition or illness, based on data collection and algorithms. Circadian rhythms show diagnostic value in phy...
Article
Full-text available
This review discusses the most relevant aspects of nutritional, reproductive and health management, the three pillars of flock efficiency, production and sustainability regarding the intensification of production in sheep and goats. In small ruminants, reproductive management is dependent on seasonality, which in turn depends on breed and latitude....
Article
Full-text available
Six cows managed under extensive grazing conditions were used to study the effect of moving the animals to a higher grazing density on the circadian rhythms of temperature (T), heart rate (HR), and activity (ACT), which were recorded by implantable bio-loggers. Cows were maintained at a density of 1.5 livestock units per hectare (LSUs/ha) (low dens...
Conference Paper
Full-text available
Los insectos pueden ser una alternativa para incluir en las raciones de los animales debido a su alto contenido en proteína. Apenas existen ensayos donde se analice la velocidad del desarrollo anatómico o conformación corporal en pollos. Un total de 32 pollos de crecimiento lento (machos Coloryield) de 1 día de edad (PV: 39,85 ± 0,06 g) se dividier...
Technical Report
Full-text available
The presence of vasectomized rams before and after artificial insemination of ewes increased litter size. Rams were introduced with the ewes 24 h after the removal of the sponges and were with the ewes for 72 h.
Conference Paper
Full-text available
Application: Although it has been reported that carrying certain genotypes of the receptor MT1 of the melatonin hormone produces an improvement of sexual performance of rams in spring, we have demonstrated that this is not related with a higher social rank or behaviour of these rams. Introduction: Melatonin secretion controls reproductive seasonal...
Conference Paper
Full-text available
Application: Implanting pregnant ewes during the second half of the pregnancy with melatonin implants improves survival and growth rates of the lambs until weaning. This is an alternative to the traditional use of implants for purely reproductive purposes. Introduction: Melatonin is widely used to improve reproductive success of sheep, particularl...
Article
Full-text available
A total of 160 1-day-old medium-growing male chicks (Gallus gallus domesticus) were raised for 120 days in a certified organic farming system. A total of two strains were studied (Coloryield, CY; RedBro, RB). Overall, two weather periods were considered based on the outdoor temperature, being S1 colder than S2. In total, 40 chicks per strain were a...
Article
The aim of this work was to evaluate the effects of exposure to artificial long days at an early age, or rearing in the presence of sexually activated adult rams, on sexual activity, testicular growth and plasma testosterone levels of autumn-born Merino ram-lambs in spring. Forty lambs born in September were assigned at 6 months of age to one of th...
Preprint
Full-text available
Background: Recent studies have shown that melatonin implants administered during pregnancy reduced neonatal lamb mortality and produced high survival rates at weaning. This study was designed to quantify the effects of melatonin implantation of ewes and lambs immediately after lambing on the growth of lambs and the quality of milk throughout lacta...
Preprint
Full-text available
Three experiments were designed to study the effects of melatonin implantation of ewes and lambs after lambing on the growth of lambs and milk quality throughout lactation. In experiment 1, 53 lambs either did (n = 28) or did not (n = 25) receive a subcutaneous 18-mg melatonin implant. In experiment 2, 55 lambs and their mothers either did (lambs:...
Article
The aim of this work was to evaluate the effects of exposure to artificial long days at an early age, or rearing in the presence of sexually activated adult rams, on sexual activity, testicular growth and plasma testosterone levels of autumn-born Merino ram-lambs in spring. Forty lambs born in September were assigned at 6 months of age to one of th...
Article
Full-text available
The objective of this study was to investigate the influence of meteorological and other factors on the quality and quantity of milk of the Spanish Churra sheep breed, based on an analysis of 359,808 milk controls from 9,904 ewes on 15 farms in 8 years. Daily milk yield (DMY), fat, protein, and lactose (%), and somatic cell count (SCC) data were ob...