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Dairy Cattle Nutrition - Science topic
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Questions related to Dairy Cattle Nutrition
hi
can anyone introduce a new technology or an article about ruminant feed, please?
thank you.
How this system works, how to apply, what kind of terms should be provide to suit the system? Thank you
I am working on coating nitrate to make it slow-release. I have made a primary product. First, XRD and IR tests were conducted to assess that. Then, I performed a pre-test to investigate its release in the rumen fluid using a "Nitrate/Nitrite Colorimetric Assay kit. However, the kits available in Iran are made for measuring nitrate and nitrite in water.
So, I would like to know your opinion and suggestion about how to measure nitrate and nitrite.
My advisor sent me the following code and told me to rewrite it in R.
proc nlin;
parms a=19 c=9 k=.08 lag=2;
*a=soluble, c=undegradable, k=rate/h, lag=lag time;
time=time-lag;
if time<0 then time=0;
b=100-a-c;
model DM=b*exp(-k*time)+c;
output out=temp p=Predicted r=Residual;
The non linear model was easy enough but I was having issues with fitting lag time. However I have written a function that works great, and I have posted it here so that it will hopefully help someone else in the future.
output1<-NULL
finaloutput<-NULL
degradfun<-function(x){
data1<-subset(DegradADJ, Subset_Term==x)
parms=list(b=100,k=0.04,c=0, lag=15)
#m<-nls(N_Disapp~b*exp(-k*(Hour-lag))+c,data=data1,start=parms)
m <- nls(formula = N_Disapp ~ ifelse(test = lag >= Hour, yes = b*exp(-k*(0))+c,
no = b*exp(-k*(Hour-lag))+c),
data = data1, start = parms)
out<-summary(m)
print(summary(m))
data1$predicted<-predict(m)
plot(data1$Hour, data1$N_Disapp, main=x)
print(lines(data1$Hour, data1$predicted, col="blue"))
output1<-data.frame(b=out$parameters[1,1], k=out$parameters[2,1], c=out$parameters[3,1], name=x)
finaloutput<<-rbind(output1, finaloutput)
}
To run a loop for all the products:
AllIDs<-unique(DegradADJ$Subset_Term)
lapply(AllIDs,degradfun)
Note: finaloutput will contain a table with all the results
To just run one:
degradfun("Product1")
If this helps you I just ask that you "recommend" this post. Thank you.
Hi everyone,
I am doing an allantoin assay in urine and all the protocols seem pretty vague. I am currently using this website which seems to be the most helpful:
It mentions that I use 15 mL tubes, but since I am boiling the samples should I use glass tubes with a cap to prevent escape? Or can I just use plastic tubes like the ones here:
Thank you!
In ruminants, nutrient inputs are first to fermentative digestion by ruminal microorganisms. The microbial fermentation products eventually become available as energy (volatile fatty acids) and protein (microbial cells) for animal tissue metabolism. However, ruminal fermentation also produces methane (CH4), carbon dioxide (CO2) and ammonia (NH3). Methane production in the rumen is an energetically wasteful process, since the portion of the animal’s feed, which is converted to CH4, is eructated as gas.
To determine the costs of feed in israeli milk production I am interested of the amount of roughage, TMR and byproducts that an average dairy cow consumes in Israel.
I am wondering if someone can advise on the best feeding regime for Red Mbororo cattle in the tropics.
The question has two parts Ancient knowledge regarding :First: 1- The precursor of milk is digested food or excretions in the stomach. Second: The role of blood in circulating the components required for milk formation.
I am asking for any help regarding the feasibility of on-site classification of antral follicle count in cows and buffaloes?
Can we perform it at any time during the estrous cycle? if so, which is the most appropriate period during the estrous cycle to perform US examination (PRO-estrus-or diestrus).
I red this updated abstract but unfortunately, the full-text was not available.
Association between antral follicle count and reproductive measures in New Zealand lactating dairy cows maintained in a pasture-based production system.
Martiniz MF, Sanderson M, Quirke LD, Lawrence SB, Juengel JL
Theriogenology. 2016 83 (3): 466-75.
Tell me your views in this sense for both dairy and beef cattle.
Anyone could provide data regarding the absorption/metabolisation of propylene glycol in powder against liquid form?
Food and protozoal N and residual N are normally calculated while knowing the effect of different feeds on rumen fermentation patterns
I want to know the best age of insemination of heifer buffaloes?
I've been reading a few things about adding salt to the grass silage, however, I was unsure if this addition will increase the cow's propensity for milk fever. I ask this because by adding Na (which is a cation) we are increasing the DCAB and elevated DCAB is supposedly related to the occurrence of milk fever.
I found that the grass silage has around 0.29% Na in DM and that in order to have a low risk of milk fever the Na content should be 17% in DM.
What can you say about this?
Thank you
Does it make sense taking into account that humans need DHA and EPA and cows scarcely convert C18:3n3 into them?
It would be useful to receive information on the dosage of specific compounds (C18:3n3, DHA, EPA, CLA, etc.) as well of their source (lineseed and others)
Hey to all!
Hope this message finds you doing well. I'm writing to ask you about the correct time of blood sampling to recognize how DCAD diets work? As it is believed "nearly all cows will experience some degree of hypocalcemia at the onset of lactation (Goff, 2014)". So, when should we draw blood to assay this problem? How many percent of cows should have normal Ca concentration (> 8.5 mg/dl)? New data from Cornell University also show that more than 55% of cows are hypocalcemic on d 1 after calving even on DCAD diets. I could not find any answer to this question. Could you please advice me on this issue?
Regards,
Ehsan
i wish to know how cassava foliage can improve milk yield in dairy cattles
I'm looking for references about milk production response to protein supplementation (preferably rapeseed/canola meal but other protein feeds do as well) at the end of lactation (around 200 days in milk, or so). Most of the studies are conducted with dairy cows at early to mid-lactation, so end-lactation studies are very difficult to find. Could anybody help me, please?
Dear peers,
I need to understand whether uniform pellet length vs. uneven length with similar ingredient composition has any impact on dairy cattle/buffalo performance?
If so, please provide its scientific basis with relevant literature link.
Thanks!
I want to supplement dairy cows' diet with rumen protected Met to enhance milk protein synthesis. I seek an efficient feed additive with sufficient protection in the rumen to use as a co-supplement with RP-Met (in synergism with together). a significant increase in milk protein (protein fractions) is expected as research target.
Most choline supplementation to ruminants is made throug 'rumen-protected choline' (RPC). There are various forms of RPC in the market, with different concentrations of choline chloride, different rumen by-pass performances, and also different release levels during post-rumen digestive tract.
In cases where rumen-protection is innefective, the majority of the choline chloride fed to animals will be degraded by rumen microbiota into TMA, and at further stage into methane. But before degradation into methane, there may be a negative impact of increased TMA concentrations in the rumen.
At post-rumen digestive tract an excess of choline cholride may have a similar fate. While ruminants will benefit from choline supplementation, if the amount made available at the gut is much larger than absorbed (required) levels, the excess tends to be converted into TMA by anaerobic microbiota.
I am looking for references on choline degradation into TMA in ruminant animals, and to which extent the amount of TMA formed may become a negative factor instead of the intended nutritional benefits of choline supplementation.
Thanks and regards to all,
Jorge
In the feed ration the percentage of dry substance is 50.42%. I need it in order to calculate the emission of Nitrates, NH3 and Phosphates in the air/soil and groundwater by the application of manure as fertilizers.
How to explain that ,NDF/ADF digestibility in dairy cattle was improved while cellulolytic bacteria numbers was decreased? Anyone can explain or have some suggestion/ reference?
i need other than DCAB balance And to be kept on a low calcium diet before parturition
I am doing a trial on the effect of phase feeding on the reproductive performance of the Fiji sheep ewes under grazing condition. I have already flushed the ewes with brewers grain (dried) for a week, mated them from late November to December, 2015. Currently awaits for their 70 day after mated for feeding.
From 0 - 70 day mated, no feeding, at 70 day feeding starts (only brewers grain), at 100 day feeding (brewers grain and copra meal), at 120 day feeding (only copra meal with additional calcium) till lambing.
Teat ends look great. Any other reason?
Actually, monensin would decrease ammonia-N concentration in the rumen, however, my research found that ammonia-N concentration was increased when supplement monensin in diet at 33mg/kg diet in cattle. How to explain?
Dry or powder Propylene glycol vs its liquid form. Is there is any difference regarding ABSORPTION/METABOLISM?
Has anyone ever used the ELISA technique for the detection of pathogens in milk of cows with mastitis? There is too little bibliography.
i need measure total-tract apparent digestibility in dairy cow with iNDF?
We use selenium to improve semen quality, and now we want to use nano-selenium
In your opinion, what percentage concentration of organic selenium must be use now
hello every body, i want to know anything about the application of nano technology in the dairy animal feeding
High water table in places where the population of cattle is more?
Hello, I'm wondering if someone knows what RIN factor should be expected from liver tissue from goats? I'm using the Agilent Bioanalyzer for that.
Thanks a lot!!
I am after some datasets or databases in Europe which shows the variability of nutritive characteristics and mineral concentrations of dairy feeds like the DairyOne in the US.
Appreciated.
How feed flavors will impact in the livestock...especially dairy animals...
Is there a publication where the energy consumption of a conventional dairy barn (natural ventilated) with around 200 dairy cows is listed?
By using above mentioned raw materials I need to formulate good ration for Frisian Jersey dairy cattles
In order to estimate metabolisable energy (ME) requirements of lactating buffaloes, three isonitrogenous rations needs to be formulated, each one with 15% variation in ME. We have two concentrate mixtures with 20% CP, and 2.5 and 2.8 Mcal/kg of ME. Is it mandatory to maintain constant forage:concentrate (F:C) ratio in such studies within the same group, as it was observed difficult to meet desired individual animal requirements without altering F:C ratio.
When working with a dairy cow that is either approaching or at peak lactation, what other feeds should be incorporated into a total mixed ration to meet her energy needs? Also, what could be limiting her highest production level?
I need to know this relationship.
Is there a way to record calf daily gains without expensive and less robust weight scales?
In cows’ reproduction, body condition as a good nutrition indicator is used
Over the past five years with field data using different protocols TAI in dairy herds realized that ovsynch and pre-synch walks very well with protocols similar to those sold in our country (Brazil) rates. And on farms where there is electronic system for detection of estrus or the use of paint on the tail had higher pregnancy rates than with the use of TAI with P4/E2.
This is just an observation of field data with approximately 10 000 inseminations.
Where to p4 / E2 pregnancy rate is 35%, Ovsynch (24%) Pre-Synch (33%) and PGF with estrus detection (40%). Average of all farms assisted 90% of cows are heat after 3 applications of PGF.
I quote from 'Natural Cattle care' " Cows who receive the right minerals and are in good health do not need teat dipping. I ran a good herd of milking goats and never used teat dips. The sphincter at the bottom of the teat stays open for about 20 minutes, after milking and for 15 minutes after calf suckling, a douche of cold water will help close.
For a project we're planning to grow different algae-species to add as a food-supplement to the (formulated) milk for calves. What species would you choose and why?
Thank you in advance for all you tips and ideas.
Trichantera is a shrub high in protein and is given in varying amounts to growing calves and adult dairy animals.
We usually follow the NRC system, but it might not be suitable within our local conditions.
Thank you in advance for your replies.
Dairy cattle need both macro and micro nutrients to be optimal in productivity.
Most methods involve GC determination of fatty acids in milk. I have some information about precolumn derivatization on HPLC. At this moment I would like to see a specific work and experience of a researcher.
For the kharif crop, it is necessary to use furadon on maize for controlling borers at 25 days after sowing the seed. Where integrated dairy and corn production farming is practiced, it is a very burning issue and hard to say exactly.
Literature says 8 mm is sufficient but when we fed TMR to dairy buffaloes with a roughage particle size of 20 mm, a better milk yield was observed in buffaloes fed TMR with 20 mm particle size. Possible reason?
