RT Journal Article
T1 Nutrition level and season of birth do not modify puberty of Payoya goat kids
A1 Zarazaga Garcés, Luis Ángel
A1 Guzmán Guerrero, José Luis
A1 Domínguez, C.
A1 Pérez, C. M.
A1 Prieto, R.
A1 Sánchez, J.
AB This study analysed the effect of level of nutrition and date of birth (age) on the onset of puberty in Payoya she-kids bornin autumn (November) or in winter (February). Two experiments were conducted to examine pubertal events at the onset ofpuberty. For each date of birth (age), two experimental groups were used, differing on the level of nutrition. Groups werebalanced for live weight (LW) and body condition score (BCS). For the first experiment (goat kids born in autumn), 27 Payoyashe-kids were used: high-nutrition group (H1, n513) and control group (C1, n514). For the second experiment (goat kidsborn in winter), 25 Payoya she-kids were used: high-nutrition group (H2, n513) and control group (C2, n512). In bothexperiments, the level of feeding was adjusted weekly according to LW so that the animals would gain about 50 and 100 gper day for C and H groups, respectively. Oestrus was tested daily using young aproned bucks. Ovulation rate was assessed bylaparoscopy 7 days after identification of oestrus. Plasma samples were obtained weekly for progesterone assay. LW and BCSwere recorded weekly. No effect of nutrition level or birth date (Experiment 1 v. 2) on the date of the first ovarian activity orthe first detected oestrus was observed. No effect of nutrition on LW or BCS at the first detected oestrus was observed. Birthdate influenced significantly the LW of the animals at the onset of ovarian activity or first oestrus (P,0.001). Irregular sexualactivity was frequently observed before the first oestrus (74.7% and 48.0% of the first reproductive activity was irregular forExperiments 1 and 2, respectively). No effect of nutrition level or birth date on ovulation rate was observed. Ovulation rateat first oestrus was influenced by LW in November-born goat kids (1.0660.06 v. 1.6760.21 corpora lutea for LW,30 and>30 kg, respectively, P,0.01). These results demonstrate that the age at puberty was very dependent upon the season ofbirth in Payoya goat kids, and that there could be some benefit in breeding November-born goat kids at a higher LW toobtain a higher prolificacy at the first kidding as a consequence of a higher ovulation rate at puberty.
PB Cambridge University Press
SN 1751-7311
SN 1751-732X (online)
YR 2009
FD 2009
LK http://hdl.handle.net/10272/6390
UL http://hdl.handle.net/10272/6390
LA eng
NO Zarazaga Garcés, L.A., Guzmán Guerrero, L.A., Domínguez, C., Pérez, C.M., Prieto, R., Sánchez, J.: "Nutrition level and season of birth do not modify puberty of Payoya goat kids". Animal. Vol. 3, n. 1, pág. 79-86 (2009). ISSN 1751-7311
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026