Buscar
Mostrando ítems 1-10 de 591
Expression of estrus improves fertility and decreases pregnancy losses in lactating dairy cows that receive artificial insemination or embryo transfer
(2016-03-01)
The objective was to evaluate if expression of estrus by dairy cattle altered fertility in timed artificial insemination (AI; n = 5,430) or timed embryo transfer (ET; n = 2,003) programs that used estradiol and progesterone ...
Estrous behavior and the estrus-to-ovulation interval in Nelore cattle (Bos indicus) with natural estrus or estrus induced with prostaglandin F2 alpha or norgestomet and estradiol valerate
(Elsevier B.V., 1998-02-01)
Estrous behavior and the estrus-to-ovulation interval are essential for estimating the best time to artificially inseminate cattle. Because these parameters are not well characterized in the Nelore breed (Bos indicus), the ...
Estrous behavior and the estrus-to-ovulation interval in Nelore cattle (Bos indicus) with natural estrus or estrus induced with prostaglandin F2 alpha or norgestomet and estradiol valerate
(Elsevier B.V., 1998-02-01)
Estrous behavior and the estrus-to-ovulation interval are essential for estimating the best time to artificially inseminate cattle. Because these parameters are not well characterized in the Nelore breed (Bos indicus), the ...
Daily lying behavior of lactating Holstein cows during an estrus synchronization protocol and its associations with fertility
(Elsevier B.V., 2017-10-01)
Objectives were to quantify lying behavior (LB) during an estradiol and progesterone-based synchronization protocol, to assess risk factors for ovulation, pregnancy per AI (P/AI), and degree of behavioral change at estrus, ...
Correlation between estrus onset and ovarian parameters in dairy goats
(Universidade Federal de Goiás, 2022-05-13)
This study assessed the effects of social dominance on the behavioral estrus and ovarian parameters of dairy goats subjected to synchronous estrus induction during the non-breeding season. Synchronous estrus was induced ...
Factors affecting expression of estrus measured by activity monitors and conception risk of lactating dairy cows
(Elsevier B.V., 2015-10-01)
The objective of this study was to determine risk-factors affecting increase in physical activity during estrus and pregnancy per artificial insemination (P/AI) in lactating dairy cows. Cows were monitored continuously by ...
Detection of estrous behavior in buffalo heifers by radiotelemetry following PGF2α administration during the early or late luteal phase
(2014-01-30)
This study examined the usefulness of radiotelemetry for estrous detection in buffalo heifers and the impact of prostaglandin F2α (PGF2α) administration during the early or late luteal phase on estrous behavior and ovulatory ...
Evaluation of a modified GnRH-based timed-AI protocol associated with estrus detection in beef heifers inseminated with sex-selected or conventional semen
(Elsevier B.V., 2018-09-15)
The main objective was to compare pregnancy per Al (P/AI) between sex-selected and conventional semen in cyclic beef heifers subjected to a 5-day Co-synch plus CIDR protocol and evaluated the usefulness of an estrus detection ...