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
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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
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Trends in Calving Ages and Calving Intervals for Dairy Cattle Breeds in the United States [PDF]
Journal of Dairy Science, 2006 Trends since 1980 for calving age and calving interval, 2 factors that influence herd life, were examined by parity for 5 breeds of US dairy cattle. Calving data were from cows with records that passed edits for USDA genetic evaluations and were in herds that remained on Dairy Herd Improvement test.
H D Norman, J R Wright
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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
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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
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SERVICE PERIOD AND CALVING INTERVAL AS INDICES OF REPRODUCTIVE PERFORMANCE OF COWS UNDER FIELD CONDITIONS [PDF]
Veterinary Medical Journal - Giza, 1994 Data on 430 artificially inseminated and 257 naturally bred cows was used to determine the service period and calving interval. Combined together the service period mean = S. E. was calculated to be 160.5 = 3.55 and calving interval (mean = S.
QURESHI L, T MAGRAY, L LODHI, G MUHAMMAD
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Revista Científica, 2023 One of the most important facts in the livestock industry is the need to increase reproductive performance to improve profitability. In the case of water buffalo cows, a calving-to-con-ception interval maximum of 90 days is recommended; however ...
Héctor Nava-Trujillo +2 more
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EFFECT OF CALVING SEASON, PARITY AND AGE AT FIRST CALVING ON PERFORMANCE TRAITS AND PHENOTYPIC CORRELATIONS BETWEEN THESE TRAITS IN HOLSTEIN FRIESIAN COWS [PDF]
Journal of Animal and Poultry Production, 2007 The effects of calving season , parity and age at first calving on performance traits and phenotypic correlations between these traits were studied in.
S. Abbas,
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Impact of age at first calving on reproduction, lactation, postpartum disorders and longevity in Holsteins under Egyptian circumstances [PDF]
Journal of Veterinary Medical Research, 2009 A retrospective study including reproductive and productive data of 1587 primiparous Holstein cows covering a period of eight years. The reproductive data ( interval to 1st service, service period, days open, number of inseminations per conception and ...
M. M. Hussein, A. A. A. El Agawany
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Month and lunar cycle at calving influence and reproductive performance of a tropical buffalo herd
Revista Científica, 2023 A retrospective study (2000-2022) was conducted in a commercial buffalo farm in Mérida State, Venezuela, to assess the effect of month and lunar cycle at calving on some reproductive variables.
José Atilio Aranguren-Méndez +5 more
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