Results 201 to 210 of about 8,210 (222)
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Evaluation of the effects of sire and dam calving group on age at first calving in Brahman heifers
Theriogenology, 2021This study evaluated the possible effects of sire and dam calving groups on age at first calving in Brahman heifers. A total of 570 heifers born between the years 2004 and 2017 were exposed as yearlings to fertile bulls through time of pregnancy determination. A calving group was determined by calculating the mean (993 d) and standard deviation (187 d)
A.L. Earnhardt +4 more
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Calving day and age at first calving in Angus heifers.
Journal of animal science, 2010Because of difficulties in data collection and analysis, in most breeds there have been limited ways to evaluate fertility in females on a between-herd basis. The objective of this study was to determine the heritabilities (direct and maternal) for CD (calving day) and AFC (age at first calving) in American Angus heifers and to evaluate the potential ...
J, Minick Bormann, D E, Wilson
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Factors Affecting Age at First Calving in Gir Cattle
International Journal of Livestock Research, 2014The production records on 228 Gir cows with 680 lactations sired by 52 bulls, maintained at Cattle Breeding Farm, Junagadh Agricultural University, Junagadh, for 24 years (1987 – 2010) were studied. The data were analyzed to study the effect of period of calving and season of calving as fixed effect on the reproduction trait viz., age at first calving.
Nikhil Dangar, Pravin Vataliya
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Variability of age at first calving and service period of first calving Simmental cows
2018Oblast reprodukcije goveda je najznačajnija faza proizvodnje jer se u toj fazi obezbeđuju grla za remont stada, proizvodnju mleka i tov, odnosno proizvodnju mesa. Ovim istraživanjem je ispitana varijabilnost uzrasta pri telenju i trajanja servis perioda prema godini i sezoni telenja kod 3.461 kontrolisane prvotelke simentalske rase na imanjima ...
Pantelić, Vlada +5 more
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Influence of the first calving age on the cow productivity indicators
2022Age at first calving is considered an important predictor of subsequent milk yield and is an extremely important economic trait determining the profit of cow milk production [1, 2]. Cow longevity and lifetime performance traits are good indicators of breeding effectiveness and animal welfare. They are also interrelated with the economics of dairy herd [
Mišeikienė, Ramutė +3 more
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An analysis of age and body weight at first calving for Holsteins in the United States
Preventive Veterinary Medicine, 1997In a national survey of US dairy producers, only 2.7 +/- 0.5% of Holstein dairy operations reported achieving recommended target ranges of age < or = 24 months and body weight (BW) > or = 550 kg at first calving. Allowing for wider target ranges, still only 14.6 +/- 1.3% of Holstein dairy operations reported achieving age < or = 25 months and BW > or =
W C, Losinger, A J, Heinrichs
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Calving day and age at first calving in Angus heifers1
Journal of Animal Science, 2010J. Minick Bormann, D. E. Wilson
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Factors Affecting Age at First Conception and Calving in Buffaloes
International Journal of Livestock Research, 2021Soniya Bashyal +2 more
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What is the best first-calving age of cows in robotic milking farms?
Italian Journal of Animal Science, 2022Abdülkadir Orman +2 more
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