Extending the duration of treatment with progesterone and equine chorionic gonadotropin improves fertility in suckled beef cows with low body condition score subjected to timed artificial insemination
| Autor: | M.I. Vázquez, Julian Bartolome, E. Turic, Maria Florencia Farcey, J. Pesoa, Luis Oscar Zapata, N. Massara, S. Ramos, M.G. Bilbao |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
medicine.medical_treatment Chorionic Gonadotropin chemistry.chemical_compound Food Animals Pregnancy Follicular phase Medicine Small Animals Insemination Artificial Progesterone media_common 04 agricultural and veterinary sciences Estradiol cypionate Body Composition Reproductive Control Agents Female PROGETERONE medicine.drug medicine.medical_specialty media_common.quotation_subject Fertility Drug Administration Schedule 03 medical and health sciences Follicle Animal science Internal medicine Animals Equine chorionic gonadotropin Equine business.industry ECG Artificial insemination Ciencias Veterinarias Body Weight 0402 animal and dairy science TIMED INSEMINATION medicine.disease 040201 dairy & animal science 030104 developmental biology Endocrinology chemistry CIENCIAS AGRÍCOLAS Estradiol benzoate BEEF COWS Animal Science and Zoology Cattle Progestins business |
| Popis: | The objective of this study was to evaluate the effect of an extended progesterone treatment on follicular development and fertility in postpartum, suckled beef cows subjected to timed artificial insemination (TAI). In experiment 1, cows (n = 24) with body condition score (BCS) ≥4.5 received either a 2-g progesterone intravaginal device on Day −23 or a 0.558-g progesterone intravaginal device on Day −9. Then, all cows received 2 mg of estradiol benzoate on Day −9; removal of the device, 1-mg estradiol cypionate, and PGF2α on Day −2; and TAI on Day 0. Metabolic status was assessed between Days −9 and −2. Ovarian structures and plasma progesterone were determined weekly from Day −23 to −9, daily from Day −9 to 0, and weekly until Day 28. In experiment 2, cows (n = 302) with BCS ≥4.5 received identical treatment to cows in experiment 1, but on Day −2, cows received 400 IU of two different commercial preparations of equine chorionic gonadotropin (eCG). Ovarian structures were determined on Days −23 and −9 on a subset of cows (n = 40). Pregnancy was determined 39 days after TAI. In experiment 3, multiparous cows (n = 244) with BCS |
| Databáze: | OpenAIRE |
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