提高牦母牛繁殖性能的研究

采用不同剂量生殖激素处理3.5岁的青年牦母牛,结果发情率提高5.84和23.26个百分点,繁殖率分别提高34.69和41.21个百分点。采用不同剂量生殖激素处理和怀孕牦母牛围产期补饲的措施,促进产后成年牦母牛发情配种,结果发情率分别提高42.42,54.67和37.51个百分点,繁殖率提高43.93,48.48和20.10个百分点。生殖激素处理和围产期补饲对提高牦牛繁殖性能有较大的促进作用,高剂量生殖激素的促进效果较明显。     

高丹草新品种在河北平原农区的引进筛选

在河北平原农区,通过对国内外11个高丹草新品种的产草量、粗蛋白产量、物候期、分蘖力、再生性、株高等性状的研究分析,结果表明：以青饲、青贮饲喂牛为目的,表现最好的品种为健宝,不仅产草量高、粗蛋白产量、分蘖能力、再生性、长势均较好。其次为晋草1号、瑞奥3号。高丹草在河北平原农区春播、夏播均可,春播可刈割三次,夏播可刈割二次。     

额济纳绿洲新疆杨硬枝扦插技术研究

本文探索了在额济纳绿洲 ,PH值为 8.55～ 9.0 2 ,地下水埋深 1 .5m的土壤条件下 ,新疆杨硬枝扦插技术及其效果 ,扦插成活率高达 85.81 %。分析认为采用 2 % TC保水剂和 3%的抗旱剂处理插穗效果不明显 ,而采用 1 0 0 ppm ABT1号处理 2 0小时效果为最好 ,比对照提高54.1 2 % ;插穗直径在 0 .8～ 2 .0 cm范围内 ,扦插效果没有明显差异。并分析了覆膜扦插效果不好的原因与技术改进方面。     

宽体金线蛭(W.pigra)养殖技术

概述了宽体金线蛭 (W .pigra)的人工繁殖、饲养和采收加工技术。     

久树组培的初步研究

久树（Schleichera trijuage Willd)为紫胶虫的优良寄主,但繁殖困难,对其进行组培研究发现：带绿色叶片的材料不易褐变而紫红色叶片的材料容易褐变;随着绿色叶齿的增加,其材料的污染率也增加,在接种时采400μg/g苄氨青液浸泡可使污染率降低;元江实生苗对昆明培养时间越长,污染率越低。     

尾部连续采血法对香猪母猪繁殖性能的影响

本项研究选用畜牧试验站内12头成年、后备香猪母猪各6头,在配种前1～2天及配种后6天的上午9:00～11:00点间,间隔10分钟,进行尾部采血,收集血样12次,观察采血对母猪情期受胎率、仔猪初生重。75天断乳重及产仔数的影响。结果表明:尾部连续采血法对母猪繁殖机能及仔猪发育无不良影响。此法简单,易学,宜于在生产中普遍应用。     

萨能奶山羊在贵州的繁殖性能观测

对贵州牧草种籽繁殖场饲养的萨能奶山羊的初情期、初配年龄、发情周期、发情持续期、发情季节、妊娠期、产羔率、羔羊公母比例等八项繁殖性能指标进行观察测定,并与西北农业大学的萨能奶山羊进行比较分析,从而看出在贵州饲养的奶山羊具有明显的早熟性。     

Effect of extruded linseed on productive and reproductive performance of lactating dairy cows

A total of 356 early lactation multiparous Holstein cows were used in a randomized complete block design to determine the effects of feeding extruded linseed on milk production and composition, and reproductive performance. Forty of these cows were randomly selected to study the effects of extruded linseed on milk fatty acid (FA) profile, individual feed intake and prostaglandin secretion. Cows were fed a 40:60 forage to concentrate ratio diet (17.9% CP, 27.7% NDF and 6.0% EE) ad libitum that was similar in composition between treatments except for the protein supplements that differed and were control (CTR: 4.9% extruded soybean) and linseed (LIN: 5.5% extruded linseed). Individual DM intake measured at 40 (23.0 kg/d) and 90 (24.2 kg/d) days in milk, and milk yield (45.0 kg/d) were not affected by treatment, but the lower (P < 0.05) milk fat percentage in cows fed LIN (2.65%) compared with CTR (2.86%) resulted in lower (P < 0.05) 4.0% fat-corrected milk yield for cows fed LIN (35.4 kg/d) compared with CTR (37.7 kg/d). Milk protein content was higher (P < 0.05) in LIN (3.04%) than in CTR (3.00%). The concentration of saturated FA was lower (P < 0.05) in milk fat from LIN (56.2%) compared with CTR (60.2%). Monounsaturated FA (35.7 vs. 32.7%) and polyunsaturated FA (8.0 vs. 6.9%) were higher in LIN (P < 0.05) than in CTR. Supplementation with LIN also increased (P < 0.05) the proportion of vaccenic acid (2.21 vs. 1.55%), total conjugated linoleic acid (0.91 vs. 0.72%) and n-3 FA (1.21 vs. 0.54%) in milk compared with CTR. Plasma concentrations of prostaglandin metabolite were numerically lower in LIN (106 pg/ml) compared with CTR (120 pg/ml) (P = 0.16) but reproductive performance was similar between treatments. In summary, extruded linseed reduced milk fat percentage and 4.0% fat-corrected milk yield and increased milk protein percentage and the content of healthy FA in milk without modifying DM intake, milk yield and reproductive performance.     

酵母硒在奶牛饲养中的应用

硒是动物机体必需的微量元素,参与体内许多重要的生理活动,而酵母硒以其易吸收及毒性小等特点受到广泛关注。文章主要介绍酵母硒对奶牛生产性能、抗氧化能力、免疫功能、繁殖性能方面的影响。     

皖西白鹅雄鹅种龄与生殖激素水平关系的研究

实验结果显示，各龄雄鹅在非生殖期血清中促黄体生成素（LH）、促卵泡刺激素（FSH）和雌二醇（E2）在血清中的含量都低于5.0 mu/ml，其差异性难以比较.4种不同种龄的雄鹅在垂体泌乳素（PRL）和孕酮（P）水平上没有显著差异.在睾酮（T）激素水平上差异很明显，即2龄种鹅＞1龄种鹅＞3龄种鹅＞4龄种鹅.可见在4个种龄的雄鹅中，2龄种鹅体内的睾酮最高，其生殖能力可能最强。