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/Jul/2009
Antônio Rodrigues da Silva, Antonio Sergio Ferraudo, Dilermando Perecin, Vera Fernanda Martins Hossepian de Lima
DOI: 10.1590/S1516-35982009000700010
The objective of this study was to evaluate the relation between the physical and morphological characteristics of semen from Bos taurus taurus and Bos taurus indicus cattle, the age of the bull and semen collection periods. Observations were made on 42 bulls with ages ranging from 12 to 174 months in five classes: subspecies Bos taurus taurus – 12 to 36 months; 37 to 60 months, 61 to 84 months, 85 to 108 months and 109 to 138 months and […]
Keywords: clustering analysis; principal components analysis; semen quality
01/Apr/2000
Elizabeth Strapasson, Roland Vencovsky, Luiz Alberto Rocha Batista
DOI: 10.1590/S1516-35982000000200008
Fifteen reproductive, 22 vegetative and 21 agronomic descriptors were evaluated, the agronomic ones comprised seven descriptors for annual, winter and summer evaluations, respectively, with the objective to select the most appropriate descriptors for characterization of Paspalum guenoarum and Paspalum plicatulum. Principal components analysis was used to discard redundante or non-discriminative descriptors. The principal component analysis allowed a reduction of 53, 68 and 43%, respectively, in the number of initial descriptors considered. By means of this technique, it was possible to […]
Keywords: accessions; germplasm; principal components analysis; selection descriptors