约互母猪与长约互母猪繁殖性能的比较分析

为了解约互母猪与长约互母猪在繁殖性能上的特点和差异,在大通县种猪场选用30窝杂种猪(其中约互7窝,长约互23窝),比较分析其产仔数,初生体质量,初生窝体质量等5个性状,结果表明:长约互母猪的仔猪的初生窝体质量和35 d龄断奶窝体质量明显高于约互母猪的仔猪(P<0.05),其它性能无明显差异。     

约互、约荣母猪用长白杜洛克公猪杂交的繁殖性能比较

采用长白、杜洛克公猪与约互、约荣母猪进行杂组合试验，在相同的饲养管理条件下测定各组合的初生及30日龄断奶指标，结果：初生时各组合的总产仔数，产活仔数，初生重无明显差异（P＞0．05）；30日龄断奶指标，各组合间断奶窝重差异不明显（P＞0．05），断奶头数约互组合明显高于约荣组合（P＜0．01）。说明含互助猪血液的约互杂种母猪产仔性能高于约荣母猪，具有一定的生产潜能。     

补铁对高原瘦肉型母系猪白系哺乳仔猪的影响

选用高原瘦肉型母系猪白系哺乳仔猪25窝261头,随机按窝分为两组。试验组13窝139头仔猪2日龄,采用深部肌肉注射的方法,头均补给右旋糖苷铁1ml（含铁100mg）,对照组12窝122头不注射,在相同条件下哺乳至35日龄断奶。结果表明,试验组窝均成活8．6头,比对照组（7．8头）多0．8头,差异显著（P〈0．05）;断奶个体重分别为7．2kg和7．0kg差异不显著（P〉0．05）;窝均收入试验组比对照组提高13．3％,效益明显。     

瘦肉型猪专门化母系——新荣昌猪Ⅰ系

１　来源及分布新荣昌猪Ⅰ系属培育品系,其选育研究历时十年,采取在荣昌猪纯系选育的基础上,导入２５％的长白猪血缘,经过５个世代的继代选育而成的瘦肉型猪专门化母系,达到瘦肉型猪国家标准（ＧＢ８４６８—８７）,获四川省政府科技进步一等奖和中国新技术新产品交易博览会金奖。该母系除保持了原荣昌猪的毛色特征、适应性强、肉质好等特性外,其生产性能也有了显著提高。２　新荣昌猪Ⅰ系母本特征２－１　体型外貌新荣昌猪Ⅰ系保持了原种荣昌猪的毛色特征,一般头部或眼圈黑色,体躯白色。该品系种猪体质健壮,结构匀称,头颈、背腰…     

PIC瘦肉型猪生产性能研究

ＰＩＣ瘦肉型猪生产性能研究许振东（福建省沙县畜牧兽医站３６５５００）程如碧（沙县畔溪种猪场）前言１９９２年底，沙县畔溪种猪场引进ＰＩＣ配套品系种猪，以杂种亲本“双杂交”的方式生产仔猪。两年间，已产仔４胎计２１１窝，母猪头均年产仔２．１８窝，每窝１２．...     

互助猪不同组合杂一代母猪的繁殖性能比较试验

本文研究了杜洛克、长白、苏白与互助猪的杂一代母猪繁殖性能。结果表明 :产仔数和产活仔数各组合母猪间差异不显著 (P >0 .0 5 ) ;初生重和初生窝重杜×互母猪显著大于苏×互母猪 (P <0 .0 5 ) ;35日龄断乳重和断乳窝重杜×互母猪极显著大于苏×互母猪 (P <0 .0 1)及长×互母猪 (P <0 .0 5 ) ,且长×互母猪显著大于苏×互母猪 (P<0 .0 5 )。     

纳雍糯谷猪母系1-3世代选育繁殖性能效果报道

纳雍糯谷猪,经过3个世代初步选育,纳雍糯谷猪母系生长速度,饲料报酬、瘦肉率均有大幅提高,纳雍糯谷猪妊娠期短(平均112.3 d),母猪乳头平均6~7对,选育后的纳雍糯谷猪母猪繁殖性能的产活仔数,第3胎以后达到9头以上,第6胎达到12头以上,初生重随着胎次的增加有逐渐增加的趋势,断奶重除第一胎外,二胎以后均达到10 kg以上,同时,经产母猪比初产母猪有更强的抗逆性。     

高原瘦肉型猪白系选育群主要繁殖性能遗传参数的估测

本文测定了高原瘦肉型猪白系选育群几个世代的主要繁殖性能的表型参数,对遗传力及表型相关进行了估测.估测结果表明:繁殖性能的变异比较大,特别是断奶时的指标;遗传力除断奶窝重和乳头数外,其他性能均在0.2以下;繁殖性能间存在着较强的相关关系,其中断奶窝重与初生窝重呈正显著相关(P<0.05),且与产仔数、活产仔数、30日龄断奶头数均呈正极显著相关(P<0.01).     

Genetic correlations of pig performance and sow productivity traits

Records for a total of 732 daughter-dam pairs were analyzed to estimate the genetic correlations of pig performance traits with sow productivity traits, with implications to the development of specialized sire and dam lines for use in crossing. Major pig performance traits analyzed included average daily gain from 56 d of age to a final weight of 90.7 kg (ADG), average backfat thickness at 90.7 kg (BF) and a performance index (PI) consisting of ADG and BF. Major sow productivity traits included number of pigs born alive in a litter (NA), litter size (N21) and litter weight (W21) at 21 d of age and two sow productivity indexes, one with NA, N21 and W21 (SPI-3) and one with NA and W21 (SPI-2). All records were expressed as deviations from breed-line-year-season means of this population. Genetic correlations were computed from daughter-dam covariances. The mean genetic correlation of PI with SPI consisted of two correlations, that of daughters' PI with dams' SPI and that of dams' PI with daughters' SPI. The mean genetic correlation of PI with SPI-3 and SPI-2 was .07 +/- .12, suggesting that concurrent improvement in both PI and SPI would not be restricted by selection within a single composite line. The genetic correlation of daughters' PI with dams' SPI (-.18 +/- .13) was appraised as more critical than the reciprocal correlation of dams' PI with daughters' SPI (+.28 +/- .13). This appraisal is based on the fact that only one generation separates a daughter's PI from her dam's SPI, as compared with two generations in the reciprocal covariance. However, the -.18 correlation was not significantly different from zero, indicating that formation of specialized sire and dam lines for use in crossing would be only marginally more effective at best for improving the overall efficiency in pork production than use of a single composite line, aside from the heterosis effects from crossing the lines. Indexes were proposed for combining PI and SPI for use either in specialized sire and dam lines or in a single composite line.     

种母猪繁殖性能的比较

以广东省东莞某猪场种母猪的繁殖性能为调查研究对象 ,以美国印地安纳州CountryLean猪场相应指标作为参照 ,通过对比研究 ,发现该场的仔猪成活率较高 ,但母猪分娩率、母猪年产仔胎数、仔猪断奶日龄、母猪头均年提供断奶仔猪和平均胎产活仔数这 5个指标较低。针对该场存在的不足 ,提出了改善种母猪群的胎次结构 ,提高公猪精液质量 ,改进配种技术与配种方法 ,加强防暑降温等措施 ,以提高母猪生产力     

某猪场母猪繁殖性能预测和logistic回归分析

为了衡量猪场生产效率,研究根据某公司7个分场繁殖母猪2016—2019年的生产记录,运用时间序列分析预测母猪繁殖性能的未来短期趋势,发现母猪未来一段时间的生产性能不会出现较大变动,与实际值较吻合,说明时间序列对母猪繁殖性能方面的预测,有较强的实用价值;再通过建立logistic回归模型,进行模型分析以寻找影响母猪繁殖性能的关键因素,进一步确定胎次是影响母猪繁殖性能重要因素。并且该模型还可用于其他生产指标的因素分析,可以为提高母猪群繁殖性能提供科学依据。     

Photoperiod and heat stress influence on lactating sow performance and photoperiod effects on nursery pig performance

Three experiments were conducted to evaluate sow and piglet productivity under extended photoperiod. In Exp. 1, 98 crossbred, lactating sows were housed in one of four treatments: thermoneutral air temperature (23.6 degrees C) in either (h of light:dark) 1:23 or 16:8 photoperiods, or heat stress (30.4 degrees C) in either 1:23 or 16:8 photoperiods. Heat stress reduced (P less than .05) sow feed intake, piglet mortality and piglet weaning weight and increased (P less than .01) sow lactation weight loss. Number of pigs weaned per litter was increased (P less than .01) when sows were heat-stressed. Extended photoperiod reduced (P greater than .05) time for sows to rebreed postweaning by .4 d. The interaction between air temperature and photoperiod was significant only for sow lactation weight loss. Heat stress increased sow lactation weight loss, but this effect was more severe in the 1:23 than in the 16:8 photoperiod. Experiments 2 and 3 examined the effects of 1:23 or 16:8 photoperiods on nursery pig performance when pigs were weaned from sows experiencing 1:23 (Exp. 3) or 16:8 (Exp. 2) photoperiods. In both nursery studies, photoperiod did not influence (P greater than .10) postweaning pig mortality, feed intake, weight gain or gain:feed ratio. In conclusion, extended photoperiod reduced days to return to estrus and reduced sow lactation weight loss, especially during heat stress. No benefits in preweaning or postweaning piglet weight or survival were observed by use of extended photoperiod.     

Effect of dietary biotin supplementation on sow reproductive performance and soundness and pig growth and mortality

A 3-yr study was conducted to evaluate the effect of dietary biotin supplementation on the reproductive performance of 90 sows and gilts, and on the pre-weaning growth and mortality of 223 litters. Corn-soybean meal-based diets supplemented with either 0 or 440 micrograms/kg d-biotin were fed to sows throughout their reproductive cycle. Biotin supplementation had no beneficial effect (P greater than .10) on 107-d sow weight, sow weight at weaning, weaning to estrus interval, foot lesion score, hair loss score, structural soundness score, number of pigs born, number and percentage of pigs born alive or number and percentage of pigs alive at 21 d of age. Biotin supplementation had no effect (P greater than .10) on pig growth or mortality to 21 d of age. These data do not support the concept that biotin supplementation of sow diets is needed.     

互助猪杂种仔猪心电图的研究

描记了１４头青海互助猪杂种仔猪６个肢导联的心电图，结果；（１）均为窦性心；ＲＲ间期：０．４３±０．０５ｓ；心电轴：６７．８°±６３．８°；（３）Ｐ波大多数呈尖峰状，在Ⅰ，ⅡａＶＬ，ａＶＦ中以正向为主，在Ⅲ、ａＶＲ中以负向为主。ＱＲＳ综合波形在Ⅰ，Ⅱ中以ｑＲ为主，在Ⅲ，ａＶＲ中以ｑＲｓ为主，在ａＶＲ中以ｒＳ为主，在ａＶＬ中以Ｑｒ为主。     

Feeding wash water solids to sows during gestation and lactation: sow productivity, pig performance, and tissue compositions.

Diets containing 0, 10, or 20% dried wash water solids (WWS) from a milk processing plant were fed to 54 Yorkshire gilts (160 to 270 kg) for five parities. Feed intake, weight changes, and morbidity of sows were measured; number of pigs per litter, birth weight, and weight gain of pigs were also determined. Blood, tissue, and milk samples were taken from sows for hematological and mineral analyses, and tissue samples were taken from newborn pigs from each treatment per parity. Overall, initial sow weight, sow weight at weaning, and weight losses were not affected (P greater than .05) by treatment. At 107 d of gestation, overall weights decreased (P less than .05) linearly with level of WWS in the diet. The number of pigs per litter and weight of pigs were not affected (P greater than .10) by diet. Concentrations of NA (P less than .10) and Cd (P less than .05) were lower in kidney of sows fed 20% WWS, and concentrations of Zn were lower in bone and in kidney of sows fed the 20% WWS diet. The Sr and Ba concentrations increased (P less than .05, P less than .10) linearly in bone from sows with level of WWS in the diet. In pigs, concentrations of Mn in kidney and Zn in liver were lower for the 20% WWS treatment. In conclusion, feeding WWS to sows over five parities had minimal adverse effects on sow productivity and pig performance; the reduction in Zn concentrations in tissues of sows and pigs seemed to be related to the Ca content of WWS.