Academic Journal
The reproductive response to the male effect of 7- or 10-month-old female goats is improved when photostimulated males are used
| Title: | The reproductive response to the male effect of 7- or 10-month-old female goats is improved when photostimulated males are used |
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| Authors: | L.A. Zarazaga, M.C. Gatica, H. Hernández, M. Keller, P. Chemineau, J.A. Delgadillo, J.L. Guzmán |
| Source: | Animal, Vol 13, Iss 8, Pp 1658-1665 (2019) |
| Publisher Information: | Elsevier, 2019. |
| Publication Year: | 2019 |
| Collection: | LCC:Animal culture |
| Subject Terms: | male effect, puberty, fertility, fecundity, productivity, Animal culture, SF1-1100 |
| More Details: | The exposure of adult, female, Mediterranean goats during anoestrus to males with induced sexual activity via photostimulation, induces a very high percentage of ovulations. The present work examines the ability of photostimulated bucks to improve the male effect-induced reproductive response of young does over that induced by non-stimulated bucks. A 2×2 factorial experiment was designed, consisting of doe age and buck photoperiod treatments. During seasonal anoestrus, 41 does aged 7 (n=19) or 10 (n=22) months were subjected to the male effect on 10 April; half of each group was exposed to males rendered sexually active by prior exposure to 3 months of long days (16 h of light/day) from 31 October (PHOTO bucks), and half to males maintained under the natural photoperiod (CONTROL bucks). Oestrous activity was recorded daily by direct visual observation of the marks left by male-worn marking harnesses over the 32 days following the bringing of the sexes together (introduction). Doe body weight and body condition were determined weekly. Ovulation was detected by measuring plasma progesterone concentrations twice per week over the 3 weeks after introduction. The ovulation rate was assessed by transrectal ultrasonography. Fecundity, fertility, prolificacy and productivity were also determined. The interaction doe age × buck photoperiod treatment had no effect on any outcome. The percentage of females showing ovulation or oestrus was higher in the does exposed to PHOTO bucks (85% v. 43% for those exposed to CONTROL bucks) they also showed higher fertility (75% v. 43%) and productivity (1.05±0.17 v. 0.57±0.16 kids born per doe serviced) (all P values at least P |
| Document Type: | article |
| File Description: | electronic resource |
| Language: | English |
| ISSN: | 1751-7311 17517311 |
| Relation: | http://www.sciencedirect.com/science/article/pii/S1751731118003397; https://doaj.org/toc/1751-7311 |
| DOI: | 10.1017/S1751731118003397 |
| Access URL: | https://doaj.org/article/b96a41ab83e949c4a8a517656ef1b2ef |
| Accession Number: | edsdoj.b96a41ab83e949c4a8a517656ef1b2ef |
| Database: | Directory of Open Access Journals |
| ISSN: | 17517311 |
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| DOI: | 10.1017/S1751731118003397 |
| Published in: | Animal |
| Language: | English |