Reproductive performance of a Nellore herd raised in the plateau of Mato Grosso State, Brazil
Reproductive performance data analyzed were those collected over an 18-year period (1955 through 1972) on a Nelore herd raised under natural conditions in file plateau of the state of Mato Grosso do Sul, Brazil. Like by all herds raised under natural conditions, a marked breeding season was found, with 86.8% of conceptions occurring during the rainy season. Age at first calving (FC), number of parturitions (NP) and calving interval were, respectively. 1407 days, four parturitions, and 514 days, with the interval between the first and the second parturition being the longest. The most important source of variation for the first two traits was year of birth of cow (P < .01). For the last trait studied significant effects (P < .01) of year of birth and age of cow were found. The correlations between FC and NP (- .28) and between FC and the first calving interval (- .20) show the necessity of determining the ideal time for breeding in order to maximize the reproductive efficiency of the cows.
| Main Authors: | , |
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| Format: | Digital revista |
| Language: | por |
| Published: |
Pesquisa Agropecuaria Brasileira
2014
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| Online Access: | https://seer.sct.embrapa.br/index.php/pab/article/view/15637 |
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| Summary: | Reproductive performance data analyzed were those collected over an 18-year period (1955 through 1972) on a Nelore herd raised under natural conditions in file plateau of the state of Mato Grosso do Sul, Brazil. Like by all herds raised under natural conditions, a marked breeding season was found, with 86.8% of conceptions occurring during the rainy season. Age at first calving (FC), number of parturitions (NP) and calving interval were, respectively. 1407 days, four parturitions, and 514 days, with the interval between the first and the second parturition being the longest. The most important source of variation for the first two traits was year of birth of cow (P < .01). For the last trait studied significant effects (P < .01) of year of birth and age of cow were found. The correlations between FC and NP (- .28) and between FC and the first calving interval (- .20) show the necessity of determining the ideal time for breeding in order to maximize the reproductive efficiency of the cows. |
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