Results 271 to 280 of about 14,782,076 (302)
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Journal of Animal Breeding and Genetics, 2008
SummaryThe breeding goal for Simmental cattle is derived for intensively managed dairy farms. Its suitability for extensive farms was addressed by analysing possible genotype by environment interaction (G × E) between the management levels for first lactation milk yield traits.
A, Gerber +3 more
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SummaryThe breeding goal for Simmental cattle is derived for intensively managed dairy farms. Its suitability for extensive farms was addressed by analysing possible genotype by environment interaction (G × E) between the management levels for first lactation milk yield traits.
A, Gerber +3 more
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Journal of Biosocial Science, 1976
The effect of four progestational drugs on the amount of milk yield in a group of lactating Egyptian women was estimated during the first year of lactation. The milk yield was highest in the women given Depo-Provera, followed by those receiving Deladroxone and quingestanol acetate.
F, Hefnawi, G, Fawzi, M H, Badraoui
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The effect of four progestational drugs on the amount of milk yield in a group of lactating Egyptian women was estimated during the first year of lactation. The milk yield was highest in the women given Depo-Provera, followed by those receiving Deladroxone and quingestanol acetate.
F, Hefnawi, G, Fawzi, M H, Badraoui
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Factors affecting weight and age at first calving, first lactation milk yield in Gir cows
Indian Journal of Animal Research, 2016The present study was undertaken on data of 113 Gir cows maintained at Kasturba Gram Dairy Farm, Indore, Madhya Pradesh, India over a period of 18 years from 1995 to 2012, based on age at first calving. The overall means for weight at first calving (WFC), age at first calving (AFC), and first lactation milk yield (FLMY) were 402.22± 1.28 kg, 1709.04 ...
Basdev Singh +4 more
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The effect of heifer rearing regime on milk yield and composition during the first lactation
BSAP Occasional Publication, 2000AbstractOne hundred and thirteen Holstein Friesian heifers (PIN (95) £88 s.d. 11.1) were used in a study to determine the effect of rearing regime, in terms of diet offered and target calving weight, on milk production in high genetic merit heifers. Eighty of the heifers were supplied from 11 commercial farms, the remainder were supplied from the herd ...
A.F. Carson, L.E.R. Dawson, F.J. Gordon
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Livestock Production Science, 2001
Abstract A nonlinear model, Wood’s function, was used to describe the shape of the lactation curve in the first three lactations of Holstein cows. Wood’s function was reparameterized to include the logarithm of persistency as a parameter. The data consisted of 65 677 test-day records of 2875 cows.
R. Rekaya, K.A. Weigel, D. Gianola
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Abstract A nonlinear model, Wood’s function, was used to describe the shape of the lactation curve in the first three lactations of Holstein cows. Wood’s function was reparameterized to include the logarithm of persistency as a parameter. The data consisted of 65 677 test-day records of 2875 cows.
R. Rekaya, K.A. Weigel, D. Gianola
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The Journal of Agricultural Science, 1913
1. The first lactation shews greater variability than the second, third, fourth or fifth.2. The estimation of one lactation from another cannot be made with great accuracy, since the correlation coefficient between even successive lactations does not rise above + ·6.3.
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1. The first lactation shews greater variability than the second, third, fourth or fifth.2. The estimation of one lactation from another cannot be made with great accuracy, since the correlation coefficient between even successive lactations does not rise above + ·6.3.
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2020
The aim of this study was to determine the effect of age at first calving on first lactation milk yield, lifetime milk yield and lifetime and to determine optimal age at first calving in order to get the highest milk yield in Turkish Holsteins in the Mediterranean Region in Turkey.
Teke B., Murat H.
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The aim of this study was to determine the effect of age at first calving on first lactation milk yield, lifetime milk yield and lifetime and to determine optimal age at first calving in order to get the highest milk yield in Turkish Holsteins in the Mediterranean Region in Turkey.
Teke B., Murat H.
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The interplay of feeding and genetics on heifer rearing and first lactation milk yield: a review.
Journal of Animal Science, 1997Weight gain of young dairy replacement heifers, even over several months, is highly variable, lowly heritable, and a poor indicator of either weight at calving or first lactation milk yield. Voluntary forage consumption is much less variable, more heritable, and a better predictor of weight at calving and milk yield.
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Efficiency of selection for different cumulative milk, fat and protein yields in first lactation
Livestock Production Science, 1987Abstract The ratio of correlated to direct annual response in 305-day yield was used to determine the efficiency of selection for different cumulative milk, fat and protein yields in first lactation. Cumulative milk, fat and protein yields for different periods in first lactation were calculated from test-day yields of 20 260 Black and White cows ...
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Effect of milk yield and milk content curve shapes on first lactation survival in large herds
2018Genetic parameters of first lactation survival and curve shape traits of milk yield, fat and protein percentages were estimated using information of 25,981 primiparous Tunisian Holsteins belonging to large herds. For each trait lactation peak, apparent persistency, real persistency and level of production adjusted to 305 days in milk were defined ...
Grayaa, Marwa +7 more
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