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The economics of calving intervals
Animal Science, 1979ABSTRACTA computerized mathematical model was used to test the economic effect of changing calving intervals under typical high-yielding (63701 per 305 days for mature cows) herd conditions at 1976 prices. The effect of month of first calving was also tested in a herd where four lactations are assumed to follow at equal calving intervals.Under the ...
A. D. James, R. J. Esslemont
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Hematology reference intervals for neonatal Holstein calves
Research in Veterinary Science, 2018Data regarding hematologic reference intervals (RI) for neonatal calves have not been published yet. The aims of this study were: a) to establish hematology RIs for neonatal Holstein calves, b) to compare them with the RIs for lactating cows, and c) to investigate the relationship of age and gender with the hematologic profile of calves.
Nikolaos Panousis +5 more
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Economic Consequences of Different Calving Intervals
Acta Agriculturae Scandinavica, 1989The study sought to answer the questions: when is the optimal time of conception for a given type of cow? and what is the economic cost of deviations from this optimum?
Erling Strandberg, Pascal A. Oltenacu
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Multivariate analysis of factors associated with calving interval and calving rate in dairy cows
Theriogenology, 1991We collected data on reproductive events of cows (n = 2116) that included dates of calving, first service, last artificial insemination before pregnancy examination, pregnancy examination, abortion, diagnosis of cystic ovary, and treatment with prostaglandin.
H O, Mohammed, M E, White, N, Lafaunce
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Factors affecting the Relationship Between Calving Interval of Cows and Weaning Weights of Calves
Journal of Animal Science, 1986Characters related to production and reproduction were observed on 744 straightbred and F2 calves and their dams produced in a five-breed diallel with Angus, Brahman, Hereford, Holstein and Jersey breeds. These data were analyzed to estimate the effects of these characters on the relationship between weaning weight and calving interval.
P E, Doren, C R, Long, T C, Cartwright
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Trends in calving ages and calving intervals for Iranian Holsteins in Fars province, southern Iran
Tropical Animal Health and Production, 2009To determine trends in calving ages and calving interval as measures of reproductive performance in Iranian Holsteins in Fars province, southern Iran during 2000-2005.Data about birth dates and previous calving dates for cows which calved between 21 March 2004 to 20 March 2005 were retrieved from the database of the Agricultural Jihad Organization of ...
Maryam, Ansari-Lari +2 more
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Reproductive Performance in Cows with Extended Calving Interval*
Reproduction in Domestic Animals, 2000Contents The effects of increased calving intervals on reproduction were studied in two herds. In Herd 1 cows were managed for 12‐ or 15‐month calving intervals and in Herd 2 for 12‐ or 18‐month intervals. Data from the study revealed that managing cows for a longer calving interval improved the fertility.
B Larsson, B Berglund
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The length of the interval between calvings
The Journal of Agricultural Science, 1927An attempt has been made to ascertain the best interval between calvings, so that the cow's average weekly yield over a long period may be at a maximum. It was only possible to consider the case of the “average cow,” but it is claimed that the general principle has been established, that cows should calve at intervals of not less than a year, and not ...
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Twin Elephant Calves and Interval Between Births of Successive Elephant Calves
1962(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
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Breed differences in calving interval in the humid Mexican tropic
Tropical Animal Health and Production, 2009The objective of this study was to evaluate the influence of breed, breed and sex of the calf, farm, calving number (CN), type of calving, and their interactions on CI using records from four different beef breeds performing in the humid tropical environment of Mexico. The influence of these factors on CN was also evaluated. CI and CN varied with farm,
Aída Lorena, Murillo Medina +4 more
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