Croker K P, Cox R I, Johns M A, Johnson T J, Roberts D, Salerian M, Sunderman F
Western Australian Department of Agriculture, South Perth.
Aust J Biol Sci. 1988;41(1):47-55.
Four experiments were conducted at different locations in Western Australia to evaluate the effectiveness of immunizing young (maiden, 1 1/2 year old) and adult Merino ewes with Fecundin to improve their reproductive performances. The ovulation rates of immunized maiden ewes was increased (0.06-0.30) above that of untreated ewes in both experiments 1 and 2. However, there were no significant improvements in the marking percentages for the immunized ewes with the differences between the untreated and immunized ewes ranging from -16.4 to 5.8%. In comparison with untreated ewes immunization 6 and 2 weeks before the start of joining depressed ewe fertility by 26.1% whereas immunization 8 and 4 weeks before the start of joining did not significantly affect fertility. The availability of oat grain ad libitum prior to parturition and during early lactation did not improve the survival of lambs born to immunized ewes. In experiments 3 and 4 immunization of adult Merino ewes increased their ovulation rates (0.41-0.63) above untreated controls and tended to increase the proportion of pregnant ewes which had multiple pregnancies (from -2.3 to 34.2%). The responses at the end of lambing were variable (from -19.8 to 37.5% lambs marked) with high lamb mortalities occurring in some experiments. There was no adverse effect on the reproductive performances following consecutive annual immunizations over 3 years and the absence of treatment for 1 year did not prevent a response in the following year.
在西澳大利亚的不同地点进行了四项实验，以评估用Fecundin免疫年轻（初产，1.5岁）和成年美利奴母羊以提高其繁殖性能的效果。在实验1和实验2中，免疫初产母羊的排卵率比未处理的母羊提高了（0.06 - 0.30）。然而，免疫母羊的产羔率没有显著提高，未处理母羊和免疫母羊之间的差异在 -16.4%至5.8%之间。与未处理的母羊相比，在配种开始前6周和2周进行免疫会使母羊繁殖力降低26.1%，而在配种开始前8周和4周进行免疫对繁殖力没有显著影响。在分娩前和哺乳早期随意提供燕麦谷物并不能提高免疫母羊所产羔羊的存活率。在实验3和实验4中，成年美利奴母羊免疫后排卵率比未处理的对照组提高了（0.41 - 0.63），并且倾向于增加怀有多胎的怀孕母羊比例（从 -2.3%至34.2%）。产羔结束时的反应各不相同（产羔率从 -19.8%至37.5%），在一些实验中羔羊死亡率很高。连续三年每年进行免疫对繁殖性能没有不良影响，但一年不进行处理并不妨碍次年产生反应。
