Effect of a single breeding season on the reproductive performance of beef cattle

Detalhes bibliográficos
Autor(a) principal: Cubas, Antonio Carlos
Data de Publicação: 2014
Outros Autores: Lesskiu, Carlos, Tahira, José Kazumassa, Mancio, Antonio Bento
Tipo de documento: Artigo
Idioma: por
Título da fonte: Pesquisa Agropecuária Brasileira (Online)
Texto Completo: https://seer.sct.embrapa.br/index.php/pab/article/view/16430
Resumo: The reproductive performance of 47 half-blood Canchim cows, systematically exposed to a breeding season from October 1st through January 31st was studied with a bull/cow ratio of 1/23. Birth rate obtained during the three years (1979 - 1981) was 61,7%. Year was a significant (P<0,05) source of variation on birth rate. The highest calving rate (82,9%) occurred in 1979 and the lowest (46,8%) in 1981. In the study of causes of linear decline in fertility among the years, it was concluded that the problem is probably correlated with the use of only one breeding season per year. Considering the three years altogether, from the 54 cows that did not calve, 27 (50%) had given birth to a calf during the second half of the birth seasons of the previous years; from the 87 cows that succeeded in calving, 72 (82,7%) had dropped their calves during the first half of the birth seasons of the previous years. The statistical analysis performed through the X-square test showed significance at the (P<0,001) level, indicating that the tendency of cows calving in the second half of the birth season not to have a calf in the following year could not be accounted for as by chance. These results indicate that, on conditions of natural grazing without supplementation, only one single breeding season per year tends to reduce fertility of cows.
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spelling Effect of a single breeding season on the reproductive performance of beef cattleEfeito de uma única estação de monta anual sobre a eficiência reprodutiva de gado de cortebirth season; fertilityépoca de parição; fertilidadeThe reproductive performance of 47 half-blood Canchim cows, systematically exposed to a breeding season from October 1st through January 31st was studied with a bull/cow ratio of 1/23. Birth rate obtained during the three years (1979 - 1981) was 61,7%. Year was a significant (P<0,05) source of variation on birth rate. The highest calving rate (82,9%) occurred in 1979 and the lowest (46,8%) in 1981. In the study of causes of linear decline in fertility among the years, it was concluded that the problem is probably correlated with the use of only one breeding season per year. Considering the three years altogether, from the 54 cows that did not calve, 27 (50%) had given birth to a calf during the second half of the birth seasons of the previous years; from the 87 cows that succeeded in calving, 72 (82,7%) had dropped their calves during the first half of the birth seasons of the previous years. The statistical analysis performed through the X-square test showed significance at the (P<0,001) level, indicating that the tendency of cows calving in the second half of the birth season not to have a calf in the following year could not be accounted for as by chance. These results indicate that, on conditions of natural grazing without supplementation, only one single breeding season per year tends to reduce fertility of cows.Foi analisado o comportamento reprodutivo de 47 vacas 1/2 Canchim, sistematicamente submetidas a estação de monta de 1.10 a 31.1, com uma proporção touro/vaca de 1/23. O trabalho envolve três anos (1979 a 1981), período em que a taxa média de natalidade foi 61,7%. Ano teve efeito significativo sobre a taxa de natalidade (P<0,05). O melhor resultado foi obtido em 1979 (82,9%) e o pior em 1981 (46,8%). No estudo das causas da queda linear da fertilidade entre os anos, concluiu-se que o problema está provavelmente correlacionado com o emprego de uma única estação de monta anual. No conjunto dos três anos, de 54 vacas que não pariram, 27 (50%) tinham parido na segunda metade da estação de nascimentos dos anos anteriores, ao passo que, de 87 vacas que pariram, 72 (82,7%) tinham apresentado partos na primeira metade da estação de nascimentos dos anos anteriores. A análise estatística, efetuada com uso do teste qui-quadrado, mostrou resultado altamente significativo (P<0,001), indicando não ser devida ao acaso a tendência de vacas que parem na segunda metade da estação de nascimentos não parirem no ano subsequente, com uso de uma única estação de monta anual. Estes resultados indicam que, em condições de pastagens naturais e sem suplementação alimentar, uma única estação de monta anual tende a diminuir a fertilidade das vacas.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraCubas, Antonio CarlosLesskiu, CarlosTahira, José KazumassaMancio, Antonio Bento2014-04-16info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/16430Pesquisa Agropecuaria Brasileira; v.17, n.12, dez. 1982; 1805-1810Pesquisa Agropecuária Brasileira; v.17, n.12, dez. 1982; 1805-18101678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAporhttps://seer.sct.embrapa.br/index.php/pab/article/view/16430/10693info:eu-repo/semantics/openAccess2014-04-16T11:50:19Zoai:ojs.seer.sct.embrapa.br:article/16430Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2014-04-16T11:50:19Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Effect of a single breeding season on the reproductive performance of beef cattle
Efeito de uma única estação de monta anual sobre a eficiência reprodutiva de gado de corte
title Effect of a single breeding season on the reproductive performance of beef cattle
spellingShingle Effect of a single breeding season on the reproductive performance of beef cattle
Cubas, Antonio Carlos
birth season; fertility
época de parição; fertilidade
title_short Effect of a single breeding season on the reproductive performance of beef cattle
title_full Effect of a single breeding season on the reproductive performance of beef cattle
title_fullStr Effect of a single breeding season on the reproductive performance of beef cattle
title_full_unstemmed Effect of a single breeding season on the reproductive performance of beef cattle
title_sort Effect of a single breeding season on the reproductive performance of beef cattle
author Cubas, Antonio Carlos
author_facet Cubas, Antonio Carlos
Lesskiu, Carlos
Tahira, José Kazumassa
Mancio, Antonio Bento
author_role author
author2 Lesskiu, Carlos
Tahira, José Kazumassa
Mancio, Antonio Bento
author2_role author
author
author
dc.contributor.none.fl_str_mv

dc.contributor.author.fl_str_mv Cubas, Antonio Carlos
Lesskiu, Carlos
Tahira, José Kazumassa
Mancio, Antonio Bento
dc.subject.por.fl_str_mv birth season; fertility
época de parição; fertilidade
topic birth season; fertility
época de parição; fertilidade
description The reproductive performance of 47 half-blood Canchim cows, systematically exposed to a breeding season from October 1st through January 31st was studied with a bull/cow ratio of 1/23. Birth rate obtained during the three years (1979 - 1981) was 61,7%. Year was a significant (P<0,05) source of variation on birth rate. The highest calving rate (82,9%) occurred in 1979 and the lowest (46,8%) in 1981. In the study of causes of linear decline in fertility among the years, it was concluded that the problem is probably correlated with the use of only one breeding season per year. Considering the three years altogether, from the 54 cows that did not calve, 27 (50%) had given birth to a calf during the second half of the birth seasons of the previous years; from the 87 cows that succeeded in calving, 72 (82,7%) had dropped their calves during the first half of the birth seasons of the previous years. The statistical analysis performed through the X-square test showed significance at the (P<0,001) level, indicating that the tendency of cows calving in the second half of the birth season not to have a calf in the following year could not be accounted for as by chance. These results indicate that, on conditions of natural grazing without supplementation, only one single breeding season per year tends to reduce fertility of cows.
publishDate 2014
dc.date.none.fl_str_mv 2014-04-16
dc.type.none.fl_str_mv
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/16430
url https://seer.sct.embrapa.br/index.php/pab/article/view/16430
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv https://seer.sct.embrapa.br/index.php/pab/article/view/16430/10693
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
publisher.none.fl_str_mv Pesquisa Agropecuaria Brasileira
Pesquisa Agropecuária Brasileira
dc.source.none.fl_str_mv Pesquisa Agropecuaria Brasileira; v.17, n.12, dez. 1982; 1805-1810
Pesquisa Agropecuária Brasileira; v.17, n.12, dez. 1982; 1805-1810
1678-3921
0100-104x
reponame:Pesquisa Agropecuária Brasileira (Online)
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repository.name.fl_str_mv Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
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