When using photostimulated bucks to induce the male effect in female goats living at Mediterranean latitudes, a male: female ratio of 1:20 is optimum
| Autor: | J.L. Guzmán, María de Lourdes Gallego-Calvo, M.C. Gatica, Luis A. Zarazaga |
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| Rok vydání: | 2017 |
| Předmět: |
Mediterranean climate
oestrous activity media_common.quotation_subject artificial photoperiod Fertility Biology 03 medical and health sciences Sexually active 0302 clinical medicine Animal science male effect Ovulation media_common lcsh:Veterinary medicine 030219 obstetrics & reproductive medicine General Veterinary Male female 0402 animal and dairy science 04 agricultural and veterinary sciences Fecundity 040201 dairy & animal science ovulation Goat lcsh:SF600-1100 Animal Science and Zoology Plasma progesterone Visual observation |
| Zdroj: | Journal of Applied Animal Research, Vol 46, Iss 1, Pp 883-887 (2018) |
| ISSN: | 0974-1844 0971-2119 |
| DOI: | 10.1080/09712119.2017.1418669 |
| Popis: | This study examines the reproductive response and reproductive performance of does subjected to the male effect at different male:female ratios when photostimulated males are used. One hundred and thirty does were distributed homogeneously into six groups with male:female ratios of either 1:30 (two repetitions of 30 females with one male each), 1:20 (20 females with one male), 1:15 (15 females with one male), 1:10 (20 females with two males), or 1:5 (15 females with three males). After the introduction of the males (all made sexually active by keeping them for three months under long days), oestrous activity was recorded daily by direct visual observation of the marks left by marking harnesses worn by the males. Ovulation was confirmed via the plasma progesterone concentration. Fecundity, fertility, prolificacy and productivity values were also determined. The 1:30 group returned the lowest percentage of does that ovulated and that showed oestrous activity; it also returned the lowest fecundity and fertility values. The highest values for all these variables were recorded for the 1:5–1:20 groups (with no significant difference between them). These results show that, under Mediterranean latitudes, the reproductive response, fecundity and fertility are diminished when the photostimulated male:female ratio is very low (1:30). The optimum ratio would appear to be around 1:20. |
| Databáze: | OpenAIRE |
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