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Variation in available shaded area changes behaviour parameters in grazing dairy cows during the warm season
(Brazilian Journal of Animal Science, 2023)
The physiology and impact on fertility of the period of proestrus in lactating dairy cows
(Brazilian Coll Animal Reproduction, 2014-07-01)
In cattle, proestrus begins with the initiation of luteolysis and ends with initiation of estrus and the GnRH/LH surge. This period is marked by a dramatic decrease in circulating progesterone (P4) that reaches a nadir by ...
The physiology and impact on fertility of the period of proestrus in lactating dairy cows
(2014-01-01)
In cattle, proestrus begins with the initiation of luteolysis and ends with initiation of estrus and the GnRH/LH surge. This period is marked by a dramatic decrease in circulating progesterone (P4) that reaches a nadir by ...
Effects of calcium salts of polyunsaturated fatty acids on productive and reproductive parameters of lactating Holstein cows
(Elsevier B.V., 2012-12-01)
Two experiments evaluated milk production, serum progesterone and insulin, and reproductive performance of lactating Holstein cows receiving or not receiving Ca salts of polyunsaturated fatty acids (PUFA), or receiving Ca ...
A new presynchronization system (Double-Ovsynch) increases fertility at first postpartum timed AI in lactating dairy cows
(ELSEVIER SCIENCE INC, 2008)
This study evaluated a novel presynchronization method, using Ovsynch prior to the Ovsynch-timed AI protocol (Double-Ovsynch) compared to Presynch-Ovsynch. Lactating Holstein (n = 337) cows, were assigned to two treatment ...
The physiology and impact on fertility of the period of proestrus in lactating dairy cows
(Brazilian Coll Animal Reproduction, 2015)