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Growth, metabolic status and ovarian function in buffalo (Bubalus bubalis) heifers fed a low energy or high energy diet
(Amsterdam, 2010)
The aim was to establish the capacity of buffalo heifers to adapt their metabolic requirements to a low energy diet. Murrah buffalo (Bubalus bubalis) heifers undergoing regular estrous cycles were randomly assigned by age, ...
Effects of bovine somatotropin administration on growth, physiological, and reproductive responses of replacement beef heifers
(2013-06-01)
This experiment compared growth, body composition, plasma IGF-I and leptin, and reproductive development of beef heifers receiving or not recombinant bovine ST (BST) beginning after weaning until the first breeding season. ...
A combination of nutrition and genetics is able to reduce age at puberty in Nelore heifers to below 18 months
(2018-03-01)
Nelore heifers usually begin their reproductive life at ≥24 months of age mainly due to suboptimal nutritional conditions and genetics. This study aimed to determine the effect of expected progeny difference (EPD) for age ...
Expression of androgen-producing enzyme genes and testosterone concentration in Angus and Nellore heifers with high and low ovarian follicle count
(2015-08-03)
Follicle population is important when animals are used in assisted reproductive programs. Bos indicus animals have more follicles per follicular wave than Bos taurus animals. On the other hand, B taurus animals present ...
Reproductive tract development and puberty in two lines of Nellore heifers selected for postweaning weight
(2013-07-01)
The objective was to evaluate reproductive tract development (ovary and uterus) and onset of puberty in two lines of Nellore heifers (Bos indicus) selected for postweaning weight. A total of 123 heifers, including 46 from ...
Effect of follicle age on conception rate in beef heifers
(Amer Soc Animal Science, 2014-03-01)
The objective of this study was to determine the effect of age of the ovulatory follicle on fertility in beef heifers. Ovulation was synchronized with the 5 d CO-Synch + controlled intravaginal drug release (CIDR) program ...
Genetic evaluation of the probability of pregnancy at 14 months for Nellore heifers
(Amer Soc Animal Science, 2002-04-01)
To estimate the heritability for the probability that yearling heifers would become pregnant, we analyzed the records of 11,487 Nellore animals that participated in breeding seasons at three farms in the Brazilian states ...
Genetic evaluation of the probability of pregnancy at 14 months for Nellore heifers
(2002-01-01)
To estimate the heritability for the probability that yearling heifers would become pregnant, we analyzed the records of 11,487 Nellore animals that participated in breeding seasons at three farms in the Brazilian states ...
Effect of early luteolysis in progesterone-based Al protocols in Bos indicus, Bos indicus x Bos taurus and Bos taurus heifers
(ELSEVIER SCIENCE INC, 2008)
The objective of this study was to evaluate the effects of treatment with an intravaginal progesterone-releasing device (CIDR) and estradiol benzoate (EB) on follicular dynamics in Bos indicus (n = 23), Bos taurus (n = ...
Evaluation of productivity of sexually precocious Nelore heifers
(Cambridge Univ Press, 2015-06-01)
The objectives of the present study were to investigate the influence of yearling weight on the occurrence of early pregnancy and to determine differences between precocious and non-precocious heifers in terms of pre- and ...