The Ovulatory response of Beef and Dairy cows subjected to two follicular emergence synchronization protocols before superovulation

Autor: M A GONZÁLEZ–RAMOS, O ÁNGEL–GARCÍA, F G VELIZ–DÉRAS, L R GAYTÁN–ALEMÁN, J M GUILLEN–MUÑOZ, A SOLÍS CORRALES, H Z GUERRERO–GALLEGO, J L MORALES–CRUZ
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Indian Journal of Animal Sciences, Vol 93, Iss 2 (2023)
Druh dokumentu: article
ISSN: 0367-8318
2394-3327
DOI: 10.56093/ijans.v93i2.128293
Popis: The aim of this study was to evaluate the superovulation response of Beef and Dairy donor cows to two different follicular emergence synchronization protocols. Twenty-two beef and dairy cows were divided into two groups viz. Conventional group (n=8) having four Holsteins and four Charolais cows between days 10 and 11 of their estrous cycle and IVD+EB group (n=14) with six Holsteins and eight Charolais cows treated with an intravaginal device (IVD) containing 1.9 g of P4 + 2 mg of estradiol benzoate (EB) between days 10 and 11 of their estrous cycle. The superovulation protocol consisted of intramuscular application of FSHp twice a day for four days, in decreasing doses (850 IU for Dairy cows and 500 IU for Beef cows). The number of follicles (13±1.1 vs. 7.5±0.9) and embryos collected (11.7±2.1 vs 6.1±1.0) were significantly affected by the treatment in the Beef cows but, the protocols did not significantly affect these variables in Dairy cows (12.2±0.9 vs 10.4±0.7, respectively). Regarding the production of non-viable embryos, a significant difference was only found in the group of Beef cows for both treatments (8.2±2.3 vs. 1.3±0.3, respectively). Results showed that IVD+EB is not necessary for the superstimulation of the emergence of a new follicular wave before superovulation when it starts in the mid-luteal phase of the estrous cycle in Holstein cows and beef cows, since they had similar results without significant differences between both treatments.
Databáze: Directory of Open Access Journals
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