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| Fialho, Fabio Rafael Leão; Rezende, Marcos Paulo Gonçalves de; Souza, Julio Cesar de; Silva, Rosana Moreira da; Oliveira, Nicacia Monteiro de; Silveira, Mauricio Vargas da. |
| Purebred and crossbred calves (n = 3,871) were selected that were born in the sub-region of the Pantanal of Aquidauana (Brazil), derived from Nellore, Brangus, Wagyu, and ½ Brangus + ½ Nellore cows, which were artificially inseminated by bulls of the Aberdeen Angus, Red Angus, Brangus, Nellore, and Wagyubreeds. Parameters such as weaning weight, daily gain from birth to weaning, and the number of days to gain 160 kg, were assessed inthese calves and phenotypic correlations between the traits were evaluated. Data were analyzed using two statistical models. The first model included sire breed effects, the genetic group of the cow, sex, year of birth (AN), birth season (EN), and the interaction AN * EN. The second model included the genetic group of the calf,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: MELHORAMENTO GENÉTICO growth; Cross; Gain; Weight.. |
| Ano: 2015 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/28345 |
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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. |
| 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... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: ZOOTECNIA beef cattle; Environmental effect; Reproductive efficiency. |
| Ano: 2015 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/24391 |
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