Results 11 to 20 of about 29,367 (283)
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
Borgu Cow Fertility in Benin: Effect of Age at First Calving on Calving Intervals
Revue d’Elevage et de Médecine Vétérinaire des Pays Tropicaux, 2002 Data collected on the farm of Kokoubou’s monastery (department of Borgu in Benin) were used to study the age at first calving and calving intervals in Borgu cows. From 1967 to 1989, 91 ages at first calving and 524 calving intervals were used.
M. Adamou N'Diaye +3 more
doaj +2 more sources
Prolonged Calving Intervals in the Nili Ravi buffalo
Italian Journal of Animal Science, 2010 The optimal calving interval for dairy buffaloes is found to be 12 to 13 months. The losses due to prolonged calving interval are amounted to one USA dollar per extra day of optimal calving interval.
S. Nasir Hussain Shah
doaj +1 more source
Scientific Papers Animal Science and Biotechnologies, 2023 Is generally known there is antagonistic relationship between production and reproduction traits. We observed this relationship in dataset of 1 197 478 daily milk records of Holstein cows on the first lactation only, first time calved during years 2003 ...
Zuzana Riecka, Juraj Candrák
doaj
Ages at Calving and Calving Intervals for Dairy Cattle in the United States
Journal of Dairy Science, 1989 Abstract Calving ages and intervals for cows first calving in 1966 to 1986 were examined for five dairy cattle breeds. For parities one through seven, mean age at each parity was lowest for Jerseys and highest for Ayrshires and Brown Swiss. Registered cows usually were older than grades for a specific parity.
Nieuwhof, G.J. +2 more
openaire +1 more source
Scientific Papers Animal Science and Biotechnologies, 2023 The aim of this paper was to study the influence of calving interval on the number of somatic cells from milk in Romanian Black and White cows. The study was conducted on a total of 125 lactations from 92 cows.
Simona Baul +7 more
doaj
Environmental effects on progesterone profile measures of dairy cow fertility [PDF]
, 2006 Environmental effects on fertility measures early in lactation, such as the interval from calving to first luteal activity (CLA), proportion of samples with luteal activity during the first 60 days after calving (PLA) and interval to first ovulatory ...
B. Berglund +32 more
core +1 more source
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
RESEARCH ON THE INFLLUENCE OF THE CALVING INTERVAL ON MILK YIELD [PDF]
Scientific Papers Series : Management, Economic Engineering in Agriculture and Rural Development, 2014 The paper goal was to study the influence of the calving interval on milk yield for the Romanian Brown breed, using 950 lactations, of which: 573 lactations (60.31 %) belonged to the over 400 days calving interval and 377 lactations (39.69%) belonged to ...
Agatha POPESCU
doaj
Reproductive qualities of dairy cows at different levels of milk yield
Аграрная наука Евро-Северо-Востока, 2021 The article presents the results of the analysis of the reproductive ability of cows depending on the level of their milk productivity. The studies were conducted in the Republic of Mari El on cows of the Holstein black-and-white breed (n = 3828).
Svetlana V. Titova
doaj +1 more source