The Revista Brasileira de Zootecnia (RBZ) is a publication dedicated to the broad field of Animal Science. We publish high-quality, original scientific research that spans across diverse areas within the discipline. The scope of RBZ encompasses a wide range of topics, including aquaculture, biometeorology and animal welfare, forage crops and grasslands, animal and forage plants breeding and genetics, animal reproduction, ruminant and non-ruminant nutrition, meat science and muscle biology, precision livestock, and animal production systems and agribusiness.
The Revista Brasileira de Zootecnia (RBZ) is a publication dedicated to the broad field of Animal Science. We publish high-quality, original scientific research that spans across diverse areas within the discipline. The scope of RBZ encompasses a wide range of topics, including aquaculture, biometeorology and animal welfare, forage crops and grasslands, animal and forage plants breeding and genetics, animal reproduction, ruminant and non-ruminant nutrition, meat science and muscle biology, precision livestock, and animal production systems and agribusiness.
The Revista Brasileira de Zootecnia (RBZ) is a publication dedicated to the broad field of Animal Science. We publish high-quality, original scientific research that spans across diverse areas within the discipline. The scope of RBZ encompasses a wide range of topics, including aquaculture, biometeorology and animal welfare, forage crops and grasslands, animal and forage plants breeding and genetics, animal reproduction, ruminant and non-ruminant nutrition, meat science and muscle biology, precision livestock, and animal production systems and agribusiness.
01/Nov/2012
Joana Ribeiro da Glória, José Aurélio Garcia Bergmann, Célia Raquel Quirino, José Reinaldo Mendes Ruas, Jonas Carlos Campos Pereira, Ronaldo Braga Reis, [...]
DOI: 10.1590/S1516-35982012001100002
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, […]
Keywords: bovine; F1; incomplete gamma function
01/Oct/2010
Joana Ribeiro da Glória, José Aurélio Garcia Bergmann, Célia Raquel Quirino, José Reinaldo Mendes Ruas, Carlos Rafael Araújo de Matos, Jonas Carlos Campos Pereira
DOI: 10.1590/S1516-35982010001000009
Lactation curves were fitted from 1,340 lactations of F1 Holstein-Gyr, Holstein-Guzerat, Holstein-Nellore and Holstein-Undefined Zebu crossbred cows from two farms with milk controls carried out every 14 days. Nutritional management was based on pastures in the summer, and corn silage and sugar cane with urea during winter and concentrated rations in the milking, according to the production. Incomplet Gamma function was used for estimating parameters of curves, production during lactation peak and of the time from the beginning of lactation […]
Keywords: cattle; F1; incomplete gamma function
01/Aug/1999
Maria Norma Ribeiro, Edgard Cavalcanti Pimenta Filho
DOI: 10.1590/S1516-35981999000400029
The objective of this experiment was to study the effect of environmental factors on the shape of lactation curves (peak yield, time of peak and persistency) of crossbred Alpine x Gurguéia goats fitted by Incomplete gamma function. Data from 6126 records of 877 lactation of 366 goats raised on Carnaúba Farm, Taperoá city, Paraíba State in the period from 1988 to 1995 were used. The function was fitted by linear regression, after logarithmic transformation and by non-linear iterative method. Adjusted […]
Keywords: goats; incomplete gamma function; lactation curve