Testosterone and LH concentrations in the male Angora goat during puberty

Özsar, Semin; Güven, Bülent; Çelebi, Mehmet; Kalkandelen, G.; Wiel, D.F.M. van de

doi:10.1016/0378-4320(90)90045-h

Cited by 3 publications

(2 citation statements)

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“…Considered together, these results suggest that at least in the above-mentioned breeds and in young males from subtropical Mexico, puberty started indifferently during increasing or decreasing days, which indicates that the influence of photoperiod on the onset of puberty was less. More generally, the age at puberty in local male goats from subtropical Mexico born in winter, spring or autumn is lower than that reported in various breeds of small ruminants from temperate and subtropical latitudes (Elwishy and Elsawaf, 1971;Chakraborty et al, 1989;Ö zsar et al, 1990;Ahmad and Noakes, 1996).…”

Section: Discussionmentioning

confidence: 68%

Season of birth modifies puberty in female and male goats raised under subtropical conditions

Delgadillo

Santiago-Miramontes

Carrillo

2007

Animal

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In seasonal goats and sheep breeds, onset of puberty is modified by the season of birth. As adult does and bucks from subtropical Mexico display seasonal variation in their reproductive behaviour, this study was carried out to determine the effect of season of birth on puberty. Three groups of each sex born in January, May and October were used. During the seasons, does and bucks were weaned at an age of 30 days and offered ad libitum alfalfa hay and 100 g of commercial concentrate. In the female kids, the onset of ovulatory activity was determined by progesterone plasma concentrations once in a week from 3 months of age until the onset of puberty. In the male kids, the onset of puberty was individually recorded by observing the ability to mount and intromit an induced oestrous female goat aged 3 months and the presence of spermatozoa in the ejaculate obtained in an artificial vagina 1 week after the first mount. In female kids, there was an effect of the season on the date of first ovulation (P < 0.001). In the May group, ovulatory activity commenced at an earlier age (201 ± 3 days) compared with January (264 ± 5 days) and October (344 ± 5 days) groups (P < 0.001). In the January group also, the ovulatory activity commenced earlier than the October group (P < 0.001). In males, an effect of the season of birth on the first mounting was observed (P < 0.001). The male kids that were born in May (111 ± 3) and October (112 ± 5 days) attained puberty earlier than those born in January (131 ± 4 days; P < 0.001). The time of onset of puberty did not differ between groups of May and October. All males showed the presence of spermatozoa in the first ejaculate obtained 1 week after the first mount. The spermatozoa in all ejaculates were immobile. It was concluded that the season of birth modified the onset of puberty in both genders, but these modifications were more pronounced in the female than in the male kid goats.

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Section: Discussionmentioning

confidence: 68%

Season of birth modifies puberty in female and male goats raised under subtropical conditions

Delgadillo

Santiago-Miramontes

Carrillo

2007

Animal

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“…Οη Ozsar et al, (1990) Delgadillo et al, (1991 Roca et al, (1992), ζε ηξάγνπο ηεο θπιήο Murciana-Granadina, φπνπ ε θηλεηηθφηεηα ησλ ζπεξκαηνδσαξίσλ βξέζεθε λα ιακβάλεη ηηο πςειφηεξεο ηηκέο ηεο θαηά ηελ αλαπαξαγσγηθή πεξίνδν θαη λα θζίλεη εθηφο θπζηθήο αλαπαξαγσγηθήο πεξηφδνπ. Οη ηηκέο πνπ ιακβάλεη ηφζν ε καδηθή θίλεζε ηνπ ζπέξκαηνο φζν θαη ε αηνκηθή θηλεηηθφηεηα ησλ ζπεξκαηνδσαξίσλ ησλ ηξάγσλ ηεο θπιήο Capra prisca, εκθαλίδνληαη πςειέο θαζ" φιε ηε δηάξθεηα ηνπ έηνπο, παξνπζηάδνληαο κηα κηθξή πηψζε φηαλ ηα δψα βξίζθνληαη εθηφο θπζηθήο αλαπαξαγσγηθήο πεξηφδνπ (Avdi et al, 2004;Παχινπ, 2007 Leboeuf et al, 1998Leboeuf et al, , 2000, Nubian (Hibbert et al, 1986), Verata, Malaguena (Perez and Mateos, 1996) θαη Rayini (Zamiri and Heidari, 2006) (Avdi et al, 2004;Παχινπ, 2007).…”

Section: δπίδξαζε ηεο ζεξκνθξαζίαο ζηα πνζνηηθά θαη πνηνηηθά ραξαθηεξηζηηθά ηνπ ζπέξκαηνοunclassified

Επίδραση Περιβαλλοντικών Παραμέτρων Στην Αναπαραγωγή Των Αιγών

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Effect of melatonin implants on sexual activity in Mediterranean goat females without separation from males

et al. 2009

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Testosterone and LH concentrations in the male Angora goat during puberty

Cited by 3 publications

References 10 publications

Season of birth modifies puberty in female and male goats raised under subtropical conditions

Season of birth modifies puberty in female and male goats raised under subtropical conditions

Επίδραση Περιβαλλοντικών Παραμέτρων Στην Αναπαραγωγή Των Αιγών

Effect of melatonin implants on sexual activity in Mediterranean goat females without separation from males

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