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 +7 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
Random Regression Analysis of Calving Interval of Japanese Black Cows [PDF]
Animals, 2021 We estimated genetic parameters for the calving interval of Japanese Black cows using a random regression model and a repeatability model. We analyzed 92,019 calving interval records of 36,178 cows. Pedigree data covered 390,263 individuals.
Shinichiro Ogawa, Masahiro Satoh
doaj +6 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 +3 more sources
Factors Affecting Calving Interval in Dairy Herds
Journal of Dairy Science, 1976 Abstract A total of 696 calving intervals on 370 cows from four breeds in the Oklahoma State University dairy herd was used to study breeding efficiency and various factors affecting calving interval within breed. Fertility of bulls differed within breeds.
H. Slama +3 more
semanticscholar +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
A Genome-Wide Association Study for Calving Interval in Holstein Dairy Cows Using Weighted Single-Step Genomic BLUP Approach. [PDF]
Animals (Basel), 2020 Simple Summary Reproductive performance is an important factor, which determines productive life and drives culling decisions in dairy herds. There are strong motives for including reproductive performance in genetic selection programs of dairy cows ...
Atashi H +6 more
europepmc +2 more sources
Variance components using genomic information for 2 functional traits in Italian Simmental cattle: Calving interval and lactation persistency [PDF]
Journal of Dairy Science, 2020 Functional traits, such as fertility and lactation persistency, are becoming relevant breeding goals for dairy cattle. Fertility is a key element for herd profitability and animal welfare; in particular, calving interval (CIN) is an indicator of female ...
Alberto Cesarani +6 more
openalex +2 more sources
Genotype by environment interaction for the interval from calving to first insemination with regard to calving month and geographic location in Holstein cows in Denmark and Sweden [PDF]
Journal of Dairy Science, 2016 The objectives of this study were to investigate genotype by environment interaction effects, with environments defined as calving month and geographic location, on the interval from calving to first insemination (CFI) of Holstein cows in Denmark and ...
Ahmed Ismael +5 more
openalex +2 more sources
Genetic and Phenotypic Parameters and Trends for Milk Yield, Service Period and Calving Interval and The Economic Impact of Extending A Calving Interval on-Farm Profitability in Friesian Cows in Egypt [PDF]
, 2019 Genetic parameters for Friesian cows were estimated from 9155 lactation records for 3635 cows sired by 184 bulls covered 34 years (1982-2015) in two herds Sakha and El-Karada , belonging to the Animal Production Research Institute, Ministry of ...
S. M. Zahed, S. Ebrahim, Y. El-Diahy
openalex +2 more sources