Environmental effects on reproductive performance of Nellore cows widely raised in the Cerrado/Pantanal ecotone
We analyzed the pregnancy rate (PR) and birth rate (BR) of Nellore cows raised extensively in the Cerrado/Pantanal during 4 mating seasons (2009-2012), assessing the relationship with the temperature and humidity index (THI) and the effect of the year and breeding season. We used information from 2,116 cows, which were categorized as either multiparous (n = 1430), primiparous (n = 338), or nulliparous (n = 348). In the months of the breeding season (December-February), temperature and relative humidity data were collected to calculate the temperature and humidity index (THI). An ANOVA was performed with a model that included sources of variation from the fixed effects of category of cow and year on PR and BR; and a linear regression analysis and correlation between THI and PR and BR. We observed a significant effect (p < 0.05) on PR. We classified the average across breeding seasons as a moderate THI. The THI of the breeding seasons showed high and significant (p < 0.05) effects only on the nulliparous BR, and low values in other categories. It is concluded that the seasonal THI was not related to the performance of cows, except BR in nulliparous cows.
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Editora da Universidade Estadual de Maringá - EDUEM
2015
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oai:scielo:S1807-867220150001000772015-03-23Environmental effects on reproductive performance of Nellore cows widely raised in the Cerrado/Pantanal ecotoneOliveira,Nicacia Monteiro deRezende,Marcos Paulo Gonçalves deAbreu,Urbano Gomes PintoRosa,Antonio do NascimentoSterza,Fabiana de Andrade MeloFialho,André Luiz Leão beef cattle environmental effect reproductive efficiency. We analyzed the pregnancy rate (PR) and birth rate (BR) of Nellore cows raised extensively in the Cerrado/Pantanal during 4 mating seasons (2009-2012), assessing the relationship with the temperature and humidity index (THI) and the effect of the year and breeding season. We used information from 2,116 cows, which were categorized as either multiparous (n = 1430), primiparous (n = 338), or nulliparous (n = 348). In the months of the breeding season (December-February), temperature and relative humidity data were collected to calculate the temperature and humidity index (THI). An ANOVA was performed with a model that included sources of variation from the fixed effects of category of cow and year on PR and BR; and a linear regression analysis and correlation between THI and PR and BR. We observed a significant effect (p < 0.05) on PR. We classified the average across breeding seasons as a moderate THI. The THI of the breeding seasons showed high and significant (p < 0.05) effects only on the nulliparous BR, and low values in other categories. It is concluded that the seasonal THI was not related to the performance of cows, except BR in nulliparous cows.info:eu-repo/semantics/openAccessEditora da Universidade Estadual de Maringá - EDUEMActa Scientiarum. Animal Sciences v.37 n.1 20152015-03-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1807-86722015000100077en10.4025/actascianimsci.v37i1.24391 |
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Oliveira,Nicacia Monteiro de Rezende,Marcos Paulo Gonçalves de Abreu,Urbano Gomes Pinto Rosa,Antonio do Nascimento Sterza,Fabiana de Andrade Melo Fialho,André Luiz Leão |
| spellingShingle |
Oliveira,Nicacia Monteiro de Rezende,Marcos Paulo Gonçalves de Abreu,Urbano Gomes Pinto Rosa,Antonio do Nascimento Sterza,Fabiana de Andrade Melo Fialho,André Luiz Leão Environmental effects on reproductive performance of Nellore cows widely raised in the Cerrado/Pantanal ecotone |
| author_facet |
Oliveira,Nicacia Monteiro de Rezende,Marcos Paulo Gonçalves de Abreu,Urbano Gomes Pinto Rosa,Antonio do Nascimento Sterza,Fabiana de Andrade Melo Fialho,André Luiz Leão |
| author_sort |
Oliveira,Nicacia Monteiro de |
| title |
Environmental effects on reproductive performance of Nellore cows widely raised in the Cerrado/Pantanal ecotone |
| title_short |
Environmental effects on reproductive performance of Nellore cows widely raised in the Cerrado/Pantanal ecotone |
| title_full |
Environmental effects on reproductive performance of Nellore cows widely raised in the Cerrado/Pantanal ecotone |
| title_fullStr |
Environmental effects on reproductive performance of Nellore cows widely raised in the Cerrado/Pantanal ecotone |
| title_full_unstemmed |
Environmental effects on reproductive performance of Nellore cows widely raised in the Cerrado/Pantanal ecotone |
| title_sort |
environmental effects on reproductive performance of nellore cows widely raised in the cerrado/pantanal ecotone |
| description |
We analyzed the pregnancy rate (PR) and birth rate (BR) of Nellore cows raised extensively in the Cerrado/Pantanal during 4 mating seasons (2009-2012), assessing the relationship with the temperature and humidity index (THI) and the effect of the year and breeding season. We used information from 2,116 cows, which were categorized as either multiparous (n = 1430), primiparous (n = 338), or nulliparous (n = 348). In the months of the breeding season (December-February), temperature and relative humidity data were collected to calculate the temperature and humidity index (THI). An ANOVA was performed with a model that included sources of variation from the fixed effects of category of cow and year on PR and BR; and a linear regression analysis and correlation between THI and PR and BR. We observed a significant effect (p < 0.05) on PR. We classified the average across breeding seasons as a moderate THI. The THI of the breeding seasons showed high and significant (p < 0.05) effects only on the nulliparous BR, and low values in other categories. It is concluded that the seasonal THI was not related to the performance of cows, except BR in nulliparous cows. |
| publisher |
Editora da Universidade Estadual de Maringá - EDUEM |
| publishDate |
2015 |
| url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1807-86722015000100077 |
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