کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2096839 1082181 2009 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of season and feeding level on reproductive activity and semen quality in Payoya buck goats
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم دامی و جانورشناسی
پیش نمایش صفحه اول مقاله
Effects of season and feeding level on reproductive activity and semen quality in Payoya buck goats
چکیده انگلیسی

The aim of this study was to determine if there is a seasonal pattern of reproductive activity in male Payoya goats and if this seasonality can be modulated by a higher level of nutrition. For a period of 16 months, 10 adult bucks were divided into two experimental groups that differed in their feeding level. The high nutrition group (H, n = 5) received 1.6 times their maintenance food requirements. The control nutrition group (C, n = 5) received a diet that supported 1.1 times their maintenance requirements. Body weight and testosterone concentrations were determined weekly, and testicular weight was determined every 2 weeks. Sexual behaviour and semen characteristics were determined monthly. Feeding level did not affect the onset or the end of the reproductive activity as measured by testosterone concentrations, with high testosterone concentrations between July and November. Ejaculation latency was positively influenced by feeding level: 43.2 ± 2.2 s vs. 61.6 ± 3.2 s for H and C group, respectively (P < 0.001). The percentage of males that ejaculated or that were sexually active was higher in the H group (P < 0.01). No differences between feeding levels were observed in the different semen characteristics studied. However, major differences between months were observed for all studied variables. These results lead us to conclude that Payoya bucks exhibit large seasonal variation in their reproductive activity. Higher feeding level allowed a better sexual behaviour in bucks in late spring, when male effect is used on the local livestock to breed females.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Theriogenology - Volume 71, Issue 8, May 2009, Pages 1316–1325
نویسندگان
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