Analysis of the Management and Costs Associated with Rearing Pregnant Dairy Heifers in the UK from Conception to Calving [PDF]
, 2015 Good management of the pregnant heifer is crucial to ensure that she is well grown and healthy and calves down easily before joining the milking herd.
Boulton, A C, Rushton, J, Wathes, D C
core +2 more sources
Reproductive performance parameters in a large population of game-ranched white rhinoceroses (Ceratotherium simum simum) [PDF]
, 2017 The population of free-roaming white rhinoceroses (Ceratotherium simum) is under serious threat. Captive breeding of this species is therefore becoming more important, but this is challenging and often not successful.
Durrant, Barbara +6 more
core +3 more sources
Relationship of dairy heifer reproduction with survival to first calving, milk yield and culling risk in the first lactation [PDF]
Asian-Australasian Journal of Animal Sciences, 2020 Objective The aim of our study was to determine the associations of heifer reproductive performance with survival up to the first calving, first-lactation milk yield, and the probability of being culled within 50 days after first calving.
István Fodor +2 more
doaj +1 more source
Heritability of Age at First Calving
Journal of Dairy Science, 1980 Abstract High heritabilities of age at first calving reported by a number of researchers may be due to confounding of service sires and time heifers were bred. Heritabilities from paternal half-sister analyses of variance models which included the effects of period of birth were less than from models where these were not included. Heritabilities were
F.R. Allaire, C.Y. Lin
openaire +1 more source
The management and associated costs of rearing heifers on UK dairy farms from weaning to conception [PDF]
, 2015 Dairy heifers only start to produce a return on investment at first calving. The length of the nonproductive rearing period is largely governed by farmer decisions on plane of nutrition and reproduction management.
Boulton, A C, Rushton, J, Wathes, D C
core +1 more source
Italian Journal of Animal Science, 2010 A total of 1551 normal lactation records of Egyptian buffaloes, Kept at Mehallet Mousa Farm, belonging to Ministry of Agriculture, during the period from 1960 to 2001 were used.
A.M. Kawthar, A.S. Khattab
doaj +1 more source
Relationship Between Age at First Calving and Longevity and Productive Life in Holstein Cows
Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 2020 The aim of the study was to evaluate the effect of age at first calving on functional traits – longevity and productive life in dairy cows. The survey included 1490 Holstein cows from 5 cattle farms in Bulgaria.
V. Valchev, I. Marinov, T. Angelova
semanticscholar +1 more source
An empirical analysis of the cost of rearing dairy heifers from birth to first calving and the time taken to repay these costs [PDF]
, 2017 Rearing quality dairy heifers is essential to maintain herds by replacing culled cows. Information on the key factors influencing the cost of rearing under different management systems is, however, limited and many farmers are unaware of their true costs.
A.C. Boulton +24 more
core +2 more sources
Analysis of non-genetic factors affecting calving difficulty in the Czech Holstein population
Czech Journal of Animal Science, 2008 The objective of this study was to analyze the effects of non-genetic factors affecting calving difficulty in the Holstein population of the Czech Republic for subsequent compilation of the model for genetic evaluation as well as for herd management ...
M. Fiedlerová +7 more
doaj +1 more source
Environmental effects, population genetic parameters, breeding value, phenotypic and genetic trend for age at first calving of Limousin cows [PDF]
Journal of Central European Agriculture, 2021 Some environmental effects, population genetic parameters, breeding value of Limousin breeding bulls, also phenotypic and genetic trends in the age at first calving (AFC) of cows between 1992 and 2013 were estimated.
Szabolcs Bene +5 more
doaj +1 more source