Open AccessEffect of follicular growth promoters on timed artificial insemination in dairy cows.
Author(s) -
Ítalo Câmara-de-Almeida,
Fabrício Albani-Oliveira,
Ana Paula Madureira,
Graziela Barioni,
Ciro A Alves-Torres
Publication year - 2020
Publication title -
revista mvz córdoba/revista mvz cordoba
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.202
H-Index - 11
eISSN - 1909-0544
pISSN - 0122-0268
DOI - 10.21897/rmvz.1966
Subject(s) - equine chorionic gonadotropin , artificial insemination , estradiol benzoate , pregnancy rate , pregnancy , follicular phase , follicle , medicine , insemination , crossbreed , follicle stimulating hormone , endocrinology , hormone , zoology , ovulation , andrology , biology , luteinizing hormone , sperm , ovariectomized rat , genetics
Objective. To evaluate the efficiency of equine chorionic gonadotropin (eCG) and follicle stimulating hormone (FSH) on the pregnancy rate of crossbred cows from different body condition score (BCS) in the postpartum period in timed artificial insemination (TAI). Material and methods. The cows were subjected to the same hormone protocol: Day zero (D0), progesterone-release intravaginal device (PRID) and 2 mg estradiol benzoate (EB); D8, withdrawal of PRID, application 0.150 mg of prostaglandin. On D8, the animals were distributed into three treatments: 1 – (TeCG; n = 98) injection of 300 IU eCG; 2 – (TFSH; n = 84) injection of 20 mg of FSH and; 3 – (Control; n = 115) without further treatment. On D9, all animals received 1 mg of EB; D10, TAI of all the cows. After 30 days from TAI, ultrasound diagnosis of pregnancy was performed. Results. Pregnancy rate did not differ among eCG (52.04%), FSH (40.47%), and Control (40.00%) treated cows (p>0.05). In cows with low body condition, the pregnancy rate was higher (p 0.05) (35–65 or 66–95days). Conclusions. The use of eCG or FSH did not result in an increase in the pregnancy rate when compared to the control treatment; however, eCG improved the pregnancy rate of cows with low body condition scores.