کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2075223 | 1544825 | 2006 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of suckling on basal and GnRH-induced LH release in post-partum dairy buffaloes
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
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چکیده انگلیسی
Suckling, a common practice in smallholder dairy-farming systems in the developing world, delays the onset of post-partum ovarian activity in dairy buffalo. The present study was designed to assess the effect of suckling on pituitary function in lactating buffaloes 25-35 days post-partum. Six suckled and nine non-suckled buffaloes were challenged intravenously with a bolus injection of GnRH (20 μg buserelin acetate; Receptal). Heparinized venous blood samples were collected at 15 min intervals for 2 h before and up to 4 h after GnRH for luteinizing hormone (LH) estimation. Pretreatment basal LH concentrations were similar in the suckled (0.6 ± 0.2 ng/ml) and the non-suckled (0.5 ± 0.1 ng/ml) buffaloes. All but one suckled buffaloes released a LH surge, starting 15-60 min post-GnRH treatment, which lasted for 180-225 min. While one suckled buffalo did not respond to GnRH, the LH response in the remaining suckled buffaloes was significantly less than in the non-suckled buffaloes in terms of peak LH concentrations (14.3 ± 2.7 ng/ml versus 26.2 ± 4.3 ng/ml) and area under the LH curve (1575.6 ± 197.4 mm2 versus 2108.9 ± 323.9 mm2). The LH response was least in suckled buffaloes challenged with GnRH while in the luteal phase of an oestrus cycle and with plasma progesterone concentration >1 ng/ml. In conclusion, suckling suppressed pituitary responsiveness to exogenous GnRH challenge in post-partum buffaloes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Animal Reproduction Science - Volume 95, Issues 3â4, October 2006, Pages 244-250
Journal: Animal Reproduction Science - Volume 95, Issues 3â4, October 2006, Pages 244-250
نویسندگان
Ashwani K. Singh, Parkash S. Brar, Amarjit S. Nanda, Bukkarao S. Prakash,