Promoting effects of an extended photoperiod treatment on the condition of hair coats and gonadal function in Thoroughbred weanlings
| Autor: | Mutsuki Ishimaru, Kazuyoshi Taya, Takehiro Harada, Kentaro Nagaoka, Gen Watanabe, Yasuo Nambo, Fumio Sato |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
photoperiodism
Coat medicine.medical_specialty Equine media_common.quotation_subject molting of winter coat progesterone Biology Note gonadal function Endocrinology Animal science Internal medicine Plasma concentration medicine extended photoperiod treatment Moulting Ovulation Thoroughbred weanling media_common |
| Zdroj: | Journal of Equine Science |
| ISSN: | 1347-7501 1340-3516 |
| DOI: | 10.1294/jes.26.147 |
| Popis: | The effects of an extended photoperiod (EP) treatment (14.5 hr light, 9.5 hr dark) on Thoroughbred colts and fillies from December 25 at 7–9 months old to the following May at 12–14 months old on coat condition and gonadal functions were investigated. Coat condition was evaluated in April. The colts and fillies in the EP treatment group changed from winter to summer coats (molting of winter coats), whereas those in the control group did not. To determine the day of first ovulation, the plasma concentrations of progesterone were measured once a month in fillies. The day of first ovulation was advanced in the EP treatment fillies compared with the control fillies. The present study clearly demonstrated that the EP treatment advanced the molting of winter coats and advanced ovulation in fillies, even in weanlings. |
| Databáze: | OpenAIRE |
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