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Environmental and genetic effects on the lactation curves of four genetic groups of crossbred Holstein-Zebu cows R. Bras. Zootec.
Glória,Joana Ribeiro da; Bergmann,José Aurélio Garcia; Quirino,Célia Raquel; Ruas,José Reinaldo Mendes; Pereira,Jonas Carlos Campos; Reis,Ronaldo Braga; Coelho,Sandra Gesteira; Silva,Martinho de Almeida e.
The objective of this study was to evaluate the effects of genetic group and environmental factors, including farm of origin, season of calving and lactation number, on the individual lactation curves of 1,010 Holstein-Gyr, Guzerat-Holstein, Holstein-Nellore, and Holstein-Zebu F1 cows on the experimental farms of the Agricultural Research Company in Minas Gerais (Empresa de Pesquisa Agropecuária de Minas Gerais, EPAMIG). Least squares analysis and the incomplete gamma function were used to investigate differences in early milk yield, peak milk yield, time from onset to the lactation peak, persistency, total milk yield and lactation duration. The highest early yields were observed for Holstein-Gyr and Holstein-Zebu, and the lowest were observed for...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bovine; F1; Incomplete gamma function.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012001100002
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Performance of lactating dairy cows fed sunflower or corn silages and concentrate based on citrus pulp or ground corn R. Bras. Zootec.
Leite,Leonardo Andrade; Reis,Ronaldo Braga; Pimentel,Patrícia Guimarães; Saturnino,Helton Mattana; Coelho,Sandra Gesteira; Moreira,Guilherme Rocha.
ABSTRACT This study aimed to evaluate the effect of diets containing sunflower or corn silages and concentrate based on citrus pulp or ground corn on intake, apparent digestibility, feeding behavior, microbial protein production, and production, composition, and fatty acid profile of milk from dairy cows. Eight multiparous lactating Holstein cows (586±61 kg live weight; 25.0±4.0 kg daily milk yield at 80 to 120 days in milk) were randomly assigned to a double 4 × 4 Latin square design with a 2 × 2 factorial array. The experimental diets were: sunflower silage + citrus pulp-based concentrate; sunflower silage + ground corn-based concentrate; corn silage + citrus pulp-based concentrate; and corn silage + ground corn-based concentrate. The dry matter intake...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Digestibility; Fatty acids; Intake; Milk composition.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982017000100056
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Yield and composition of milk from dairy cows fed diets containing cashew nuts Rev. Ciênc. Agron.
Pimentel,Patrícia Guimarães; Reis,Ronaldo Braga; Neiva,José Neuman Miranda; Coelho,Sandra Gesteira; Pinto,Andréa Pereira.
ABSTRACT This work evaluated the production and composition of milk from dairy cows fed increasing levels of cashew nuts in the concentrate portion of the diet. Eight Holstein multiparous cows were used, between the third and fifth lactation, with an average milk yield of 28.0 ? 4.0 kg day-1, arranged in a double 4 x 4 Latin square experimental design. The assessed diets consisted of including different amounts of ground cashew nuts (CN): 0; 80; 160 and 240 g kg-1 of concentrate portion, which resulted in ether extract contents of 31.6; 46.0; 68.9 and 73.1 g kg-1 of dietary dry matter, respectively. Corn silage was used as the only roughage at a proportion of 50% and diets were formulated to be isoprotein. Diet was offered as a complete mixture. Average...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Byproduct; Conjugated linoleic acid; Lipids; Milk fat; Milk protein.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000400700
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