Evaluation of melatonin and bromocryptine administration in Spanish goats II. Effect on seasonal cashmere growth, yield and fiber characteristics of does
Evaluation of melatonin and bromocryptine administration in Spanish goats II. Effect on seasonal cashmere growth, yield and fiber characteristics of does
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DOI：
10.1016/s0921-4488(03)00056-7
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发表时间：
2003-07-01
影响因子：
1.8
通讯作者：
Gipson, T
中科院分区：
文献类型：
--
作者：
Wuliji, T;Litherland, A;Gipson, T
西班牙山羊春季繁殖的操作可以提高繁殖效率、出毛率和产绒量。本试验选用15只西班牙母山羊和65只小山羊，研究了褪黑激素处理对春季繁殖期山羊绒纤维生长速度、长度和特性的影响。治疗如下：对照组（C）;褪黑激素植入物（MI）和溴隐亭（225 mg）植入物（MIB）;以及每天口服施用3 mg褪黑激素（MO）或溴隐亭（MOB）。从1999年2月至2000年1月，通过每月在山羊的中侧上剪下10 cm x 10 cm的纤维来监测羊绒生长速率。在4月（42、76、72、75和65 mg/天）和5月（C、MI、MIB、MO和MOB分别为37、64、74、58和58 mg/天），褪黑激素治疗组的平均每日清洁纤维生长率（mg/天）大于C组（P < 0.05）。对于C、MI、MIB、MO和MOB，贴片中12个月期间的总体纤维生长分别为12.5、15.9、15.3、13.1和12.9 g，MI和MIB组的纤维生长大于（P < 0.05）其他组。春季，MI、MIB、MO和MOB组绒纤维直径显著大于C组（17、19、19、18和18 μ）（P < 0.05）。在夏季，C、MI、MIB、MO和MOB的纤维直径在各处理中最低（P < 0.05）（分别为17、19、19、18和19 μ m）。总之，这些结果表明，褪黑激素口服或在一个缓慢释放的植入物，在春天的季节繁殖延长羊绒生长周期，这可以增加羊绒产量的西班牙山羊。(C)2003 Elsevier Science B. V.保留所有权利。
Manipulation of spring breeding in Spanish goats could improve reproductive efficiency, kidding rate and cashmere production. Spanish female goats (15 does and 65 doelings) were used to determine the effects of melatonin treatment on cashmere fiber growth rate, length and characteristics during spring breeding. Treatments were as follows: control (C); melatonin implant (MI) and with a bromocryptine (225 mg) implant (MIB); and oral administration of 3 mg per day of melatonin (MO) or with bromocryptine (MOB). Cashmere growth rate was monitored by monthly clipping of fiber in a 10 cm x 10 cm patch on the mid-side of goats from February 1999 to January 2000. Mean daily clean fiber growth rate (mg per day) was greater (P < 0.05) for melatonin-treated groups compared with C in April (42, 76, 72, 75 and 65 mg per day) and May (37, 64, 74, 58 and 58 mg per day for C, MI, MIB, MO and MOB, respectively). Overall 12-month period fiber growth in patches was 12.5, 15.9, 15.3, 13.1 and 12.9 g for C, MI, MIB, MO and MOB, respectively, being greater (P < 0.05) for MI and MIB than for other groups. Cashmere fiber diameter was greater (P < 0.05) for MI, MIB, MO and MOB as compared with C (17, 19, 19, 18 and 18 mu) during the spring. Fiber diameter of C was lowest (P < 0.05) among treatments (17, 19, 19, 18, and 19 mum for C, MI, MIB, MO and MOB, respectively) during summer. In summary, these results suggest that melatonin given orally or in a slow release implant for out of season breeding in the spring extends the cashmere growth cycle, which can increase cashmere production by Spanish goats. (C) 2003 Elsevier Science B.V. All rights reserved.