Genetic relationship of age at first calving with conformation traits and calving interval in Hanwoo cows [PDF]
Journal of Animal Science and Technology, 2021 This study was performed to investigate genetic relationship of age at first calving (AFC) with body development and reproduction capacity in female Hanwoo.
SeungGyu Shin, JungJae Lee, ChangHee Do
doaj +5 more sources
The Effect of Age at First Calving and Calving Interval on Productive Life and Lifetime Profit in Korean Holsteins [PDF]
Asian-Australasian Journal of Animal Sciences, 2013 This study was performed to estimate the effect of age at first calving and first two calving intervals on productive life and life time profit in Korean Holsteins.
Changhee Do +6 more
doaj +5 more sources
The association between age at first calving and survival of first lactation heifers within dairy herds [PDF]
Animal, 2016 The objective of this research was to evaluate the survival rate of primiparous heifers within a large sample of herds across the United Kingdom and specifically to assess the association between age at first calving (AFC) on their survival.
V.E. Sherwin +3 more
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Fecundity of the Lagune Cow in Benin. Age at first calving and Calving Intervals
Revue d’Elevage et de Médecine Vétérinaire des Pays Tropicaux, 2005 Data collected from 1987 to 2003 at the Samiondji farm in Benin were used to study the age at first calving (n = 200) and calving intervals (n = 805) in the Lagune cow.
T.I. Alkoiret, A.B. Gbangboche
doaj +3 more sources
Optimisation of age at first calving in Karan Fries cattle
Indian Journal of Animal Sciences, 2016 The study was conducted on the performance records of age at first calving (AFC) spread over a period of 15 years on Karan Fries crossbred cattle maintained at Livestock Research Centre.
K PUHLE JAPHETH +5 more
doaj +4 more sources
Animal, 2013 The effects of first calving (FC) in Holstein heifers on their first lactation, second lactation and lifetime milk production were examined from an initial database of 459 743 animals that first calved between 1 January 1990 and 31 July 2010 in Wallonia,
E. Froidmont +5 more
doaj +5 more sources
Optimal Age at First Calving in Pasture-Based Dairy Systems
Dairy, 2023 The age at first calving (AFC) is one of the most used indicators to evaluate the efficiency of rearing systems in dairy herds. The objective of the present study was to evaluate the association between AFC and different parameters of productive and ...
Bernardo Vargas-Leitón +3 more
doaj +4 more sources
Borgu Cow Fertility in Benin: Effect of Age at First Calving on Calving Intervals
Revue d’Elevage et de Médecine Vétérinaire des Pays Tropicaux, 2002 Data collected on the farm of Kokoubou’s monastery (department of Borgu in Benin) were used to study the age at first calving and calving intervals in Borgu cows. From 1967 to 1989, 91 ages at first calving and 524 calving intervals were used.
M. Adamou N'Diaye +3 more
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Genomic evaluation of age at first calving [PDF]
Journal of Dairy Science, 2017 From their time of birth until their first lactation, dairy heifers incur management, health, and feed expenses while not producing milk. Much effort has been made to estimate optimal ages of first calving (AFC) for cows to reduce these costs, which can be as high as $2.50 per day, and ensure that animals are productive earlier in life. To identify AFC
J L Hutchison, D J Null, John B Cole
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Comparisons of Holsteins with Brown Swiss and Jersey Cows on the Same Farm for Age at First Calving and First Calving Interval [PDF]
Journal of Dairy Science, 2005 Our objective was to evaluate breed differences for heat-stress resistance as reflected by age at first calving and first calving interval. We examined the effect of geographic location and birth season on age at first calving, and geographic location and first calving season on first calving interval on Holsteins and Jerseys, and Holsteins and Brown ...
B G Cassell, R E Pearson, I Misztal
exaly +3 more sources