Evaluation of Systematic Breeding Programs for Lactating Dairy Cows: A Review
نویسندگان
چکیده
منابع مشابه
Economic evaluation of stall stocking density of lactating dairy cows.
An increase in stall stocking density (SSD), as measured by the number of lactating cows per stall in a freestall barn, reduces cow performance, such as milk yield and fertility, but may increase farm profitability. Our objectives were to calculate effects of varying SSD on profit per stall for a range of effects on cow performances and external farm factors and store results in regression meta...
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Supplementing cows with fat can have several beneficial effects. It usually increases the energy density of the diet as starch or fiber is replaced with fatty acids. If milk production is increased, then feed efficiency may be improved. Less heat may be produced in the rumen during digestion of fat-supplemented diets as fatty acids are not digested in the rumen. Less heat produced during digest...
متن کاملRanking Dairy Cows for Optimal Breeding Decisions
This paper discusses when to start and stop breeding cows in their lactation. First, a review of the literature on the optimal voluntary waiting period (when to start breeding cows) shows that there is not much consensus on how long the economically optimal voluntary waiting period is. Secondly, the paper then describes a computer program that calculates the insemination value (IN$) for cows in...
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Myostatin or growth and differentiation factor 8 (GDF8), has been known as the factor causing double muscling phenotypes in which a series of mutations make the myostatin protein inactive, hence disabling it to regulate the deposition of muscle fibre. This phenotype happens with high frequency in a breed of sheep known as the Texel. Quantitative trait loci (QTL) studies show that a portion of t...
متن کاملLECITHIN AS A SUPPLEMENT FOR MID-LACTATINg DAIRy COwS
1 Dept of Medicine Animal, Production and Health Padova Univ., Agripolis, Viale dell’Università, 16, 35020 Legnaro (PD), Italy 2 Istituto Zooprofilattico delle Venezie, Viale dell’Università, 10, 35020 Legnaro (PD), Italy ABSTRACT The study aimed at evaluating the effect of a daily dose of 14 g of choline administrated by using soy lecithins (LC group), a by-product of the biodiesel production ...
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ژورنال
عنوان ژورنال: Journal of Dairy Science
سال: 1998
ISSN: 0022-0302
DOI: 10.3168/jds.s0022-0302(98)75679-6