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
doaj +10 more sources
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 +6 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 +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
Association between age at first calving, first lactation traits and lifetime productivity in Murrah buffaloes. [PDF]
Anim Biosci, 2022 Objective: This study was conducted to estimate the association of age at first calving (AFC) with first lactation traits as well as lifetime performance traits in Murrah buffaloes.Methods: Data on first lactation and life time performance of Murrah buffaloes (n = 679), maintained at Indian Council of Agricultural Research-Central Institute for ...
Tamboli P +4 more
europepmc +6 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 +4 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
J L, Hutchison +4 more
semanticscholar +5 more sources
Effects of season and age at first calving on genetic and phenotypic characteristics of lactation curve parameters in Holstein cows [PDF]
Journal of Animal Science and Technology, 2016 In this research data representing 72,946 primiparous cows from 724 herds with 638,063 total test day records calved between 2001 and 2011. These data were analysed to determine the effect of age at first and season of calving on parameters of the Wood ...
Mahdi Elahi Torshizi
doaj +3 more sources
Association between age at first calving and lactation performance, lactation curve, calving interval, calf birth weight, and dystocia in Holstein dairy cows. [PDF]
PLoS One, 2021 In the present study, records on 115,291 heifers distributed in 113 herds were used to investigate the association between age at the first calving (AFC) and lactation performance, lactation curve, the length of the first calving interval (CI), calf ...
Atashi H, Asaadi A, Hostens M.
europepmc +2 more sources
Genome-wide scan highlights the role of candidate genes on phenotypic plasticity for age at first calving in Nellore heifers. [PDF]
Sci Rep, 2020 Age at first calving (AFC) plays an important role in the economic efficiency of beef cattle production. This trait can be affected by a combination of genetic and environmental factors, leading to physiological changes in response to heifers’ adaptation
Mota LFM +6 more
europepmc +2 more sources