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/Dec/2005
Maurício Dallmann da Silva, Júlio Otávio Jardim Barcellos, Ênio Rosa Prates
DOI: 10.1590/S1516-35982005000600031
A 45-d experiment was conducted to evaluate two breeding ages of Hereford heifers, 18 (18M) or 24 months (24M), using natural mating. The following parameters were studied: pregnancy rate (PR), body condition score at the beginning of the mating season (BCS), and average daily gain in the mating season (ADG). It was also calculated the productivity (P) = total kg of weaned calf per number of heifers bred and efficiency (E) = productivity per 100 kg of heifers mated. The […]
Keywords: autumn breeding; eficiency; pregnancy rate; productivity
01/Jun/2002
Luciane Salgueiro Pio de Almeida, José Fernando Piva Lobato, Flávio Schramm Schenkel
DOI: 10.1590/S1516-35982002000500019
The experiment was run at the Agronomic Experimental Station of the Federal University of Rio Grande do Sul, located in the district of Eldorado do Sul, Brazil. The objective of the study was to evaluate the effect of the date of early (01/05/99) or conventional (03/26/99) weaning on the reproductive performance of multiparous beef cows during two mating seasons, 98/99, and the subsequent, 99/00. Fifty cows had their calves weaned with an average age of 91 days old and a […]
Keywords: beef cows; body condition; pregnancy rate; reproductive performance; weaning age
01/Apr/2001
Antonio Marcos Galimberti, Francisco Aloízio Fonseca, Manoel Carlos Couto Araujo, Eduardo Paulino da Costa, Célio de Freitas, José Domingos Guimarães, [...]
DOI: 10.1590/S1516-35982001000200009
Forty-two crossbred dairy cows or heifers were randomly allocated to two treatments: T1 (n=22) – control group, without hormonal treatment; T2 (n=20) – treated group with buserelin in the fourth day after embryo transfer, to evaluate the effect of hormonal treatment on the pregnancy rate and plasma concentrations of progesterone in bovine embryo recipients. Blood collection samples for plasma obtainment were realized on day of embryo transfer (day 0) and every other day, in a total of five samples per […]
Keywords: bovine; buserelin; embryo transfer; pregnancy rate; progesterone