Genetic Parameters for Age at First Calving and First Calving Interval of Beef Cattle [PDF]
Animals, 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
Michaela Brzáková +4 more
core +4 more sources
Italian Journal of Animal Science, 2010 Genetic parameters for the relation between the traits of milk yield (MY), age at first calving (AFC) and interval between first and second calving (IBFSC) were estimated in milk buffaloes of the Murrah breed.
R.R. Aspilcueta Borquis +5 more
doaj +6 more sources
OPTIMIZATION OF AGE AT FIRST CALVING IN KARAN FRIES CATTLE [PDF]
Exploratory Animal and Medical Research, 2012 Data on 571 Karan Fries (crossing Tharparkar and Sahiwal cows with American Holstein Friesian sires) at NDRI, Karnal was studied for determination of optimum age at first calving (AFC).
P.K.Panja, S. Taraphder
doaj +2 more sources
The effect of age at first calving on the milking performance of primiparous Jersey cows [PDF]
Roczniki Naukowe Polskiego Towarzystwa Zootechnicznego, 2021 The aim of this study was to determine the effect of age at first calving on the milking performance of primiparous Jersey cows (261 cows). Analyses were conducted on 2461 test day milking samples from 17.09.2007 to 26.07.2016.
Jarosław Pytlewski +1 more
doaj +2 more sources
Impact of age at first calving on performance traits in Irish beef herds [PDF]
Journal of Animal Science, 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, Alan J, Cromie, Andrew R
openaire +3 more sources
Genetic relationships between calving date, calving interval, age at first calving and type traits in beef cattle [PDF]
Livestock Production Science, 2002 In this paper the genetic relationships between major reproductive traits in beef cattle (Calving Date, Calving Interval and Age at First Calving) and type traits have been estimated to evaluate the usefulness of type classification in predicting reproductive performance in beef cattle.
Gutiérrez, J.P. (Juan) +5 more
openaire +3 more sources
NON GENETIC FACTORS EFFECT ON REPRODUCTIVE PERFORMANCE AND PREWEANING MORTALITY FROM ARTIFICIALLY AND NATURALLY BRED IN BALI CATTLE [PDF]
Journal of the Indonesian Tropical Animal Agriculture, 2011 The aim of this study was to evaluate effect of non genetic factors on reproductive performance of Bali cattle. Data on reproduction performance were collected from Breeding Centre of Bali Cattle in Denpasar-Bali.
A. Gunawan +3 more
doaj +2 more sources
Genotype-environment interaction for age at first calving in Holstein cows in Brazil [PDF]
Veterinary and Animal Science, 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 ...
Jarbas Corrêa Santos +4 more
openaire +4 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 +2 more sources
Identification of markers for functional traits in Murrah buffaloes
Indian Journal of Animal Sciences, 2021 Twelve half sib families were created and two functional traits, viz. age at first heat and age at first calving were recorded for 4,851 and 946 daughters belonging to 12 sires.
UPASNA SHARMA +5 more
doaj +1 more source