Results 1 to 10 of about 8,136 (148)
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
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
Genetic Parameters for Age at First Calving and First Calving Interval of Beef Cattle. [PDF]
Animals (Basel), 2020 The objective of this study was to estimate genetic parameters for age at first calving (AFC) and first calving interval (FCI) for the entire beef cattle population and separately for the Charolais (CH) and Aberdeen Angus (AA) breeds in the Czech Republic. The database of performance testing between the years 1991 and 2019 was used. The total number of
Brzáková M +4 more
europepmc +4 more sources
Impact of age at first calving on performance traits in Irish beef herds. [PDF]
J Anim Sci, 2023 Abstract Reducing age at first calving (AFC) has been a challenge in beef herds. There is anecdotal evidence that herd owners choose to calve heifers older because of the perceived consequences of calving heifers at 24 mo of age compared to 36 mo on performance traits in beef herds.
Twomey AJ, Cromie AR.
europepmc +3 more sources
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
John B Cole +2 more
exaly +3 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 +3 more sources
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 ...
Ignacy Misztal +2 more
exaly +3 more sources
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
doaj +3 more sources
Genotype-environment interaction for age at first calving in Holstein cows in Brazil. [PDF]
Vet Anim Sci, 2020 Dairy cattle production is distributed throughout the Brazilian regions. However, Brazilian producing regions are different in air temperature and humidity, diet, birth season, and other factors that may alter the reproductive performances of cows. The age of the cow at first calving (AFC) is a good indicator of sexual precocity since it shows the ...
Santos JC +4 more
europepmc +4 more sources