猪的血浆生化指标和蛋白位点基因平均杂合度与断奶重关系的研究

本研究以衡阳市外贸种猪场长白、大约克夏、杜洛克三个品种猪为研究对象，对猪血浆１９种生化指标和４种蛋白位点基因平均杂合度进行了测定，并研究了它们与断奶重的关系。结果表明，ＬＤＨ、ｒ－ＧＴ、Ａｍｙ、ＴＬ四个指标在品种间差异显著或极显著；断奶重与血浆生化指标的相关程度和性质依不同猪种而异；蛋白位点基因平均杂合度与断奶重的相关系数为０．３４１１，呈较强的正相关。

Effects of fish meal and sodium butyrate on growth performance, gut development and glucagon-like peptide-2 secretion in weanling piglets

The experiment was conducted to study the effects of fish meal and sodium butyrate on growth performance, gut development and GLP-2 secretion in weanling piglets. A 2×2 factorial design was used with two fish meal levels （0, 5%）, and two sodium butyrate levels （0, 0.3%）. There were 4 dietary treatments： control diet （CD）; control diet supplemented with fish meal （CF）, control diet supplemented with sodium butyrate （CB）, control diet supplemented with fish meal and sodium butyrate （FB）. A total of 44 28-days-old Large White×Landrace weanling piglets were randomly allotted into 4 treatment averagely. The experiment period was 14 days. The results showed that sodium butyrate＇s addition increased average diary gain （ADG）, average diary feed intake （ADFI） and gain to feed intake ratio （G：F） of weanling piglets （all P〈0,05）, improved gut morphology （mucosa thickness, ratio of villous height to crypt depth） and sucrase activity, and fish meal＇s addition increased maltase activity （all P〈0.05）. Either sodium butyrate or fish meal addition decreased cecum colibacillus quantity, sodium butyrate increaded ratio of cecum lactobacilli to colibacillus （P〈0.05）. Consequently, diarrhea was reduced in diet supplemented with fish meal （P=-0.08） and diet supplemented with sodium butyrate （P=0.15） through 14 days of experiment, significant reduction of diarrhea rate was observed in diet supplemented with fish meal through the first 7 days （P〈0.05）. In addition, sodium butyrate and fish meal addition in diets tended to increase plasma GLP-2 concentration, however, GLP-2 concentration on the 4th day was consistently decreased in diet supplemented with fish meal relative to that on day 0 （P=0.08）. Overall, it could be concluded that both sodium butyrate and fish meal addition improve intestinal development and sodium butyrate addition significantly increase growth performance. The gut trophic response to sodium butyrate or may be in agreement with development. peptide GLP-2 increases in fish meal addition in diet and the alteration of intestinal

Impact of Probiotic Supplement on the Weight Lose of Sows and Weaning Weight of Piglet

The aim of this field study was to evaluate the influence of the probiotic BioPlus 2B on the weight loss of sows during lactation and weaning weight of litter and piglets. A total of 126 gilts/sows on commercial pig farm were allocated to either group of 61 sows supplemented with probiotic BioPlus 2B 400 g per ton or a non-supplemented control group of 65 sows from two weeks before farrowing to weaning. Microbiological contents of feed rations were analyzed. Data were statistically processed by MS Excel program package using methods for descriptive statistics, analysis of variance and t-test. Lactating sows supplemented with probiotic BioPlus 2B increased their feed intake. It reduced sows weight loss during lactation; weight loss was 40.4-44.8 kg in controls versus 18.0-23.0 kg in supplemented sows （p 〈 0.05）. Insemination of sows was done 4-5 day after weaning. Repeated insemination was needed for more sows in control group-22 sows in the control group vs. 12 sows in the supplemented group （p 〈 0.05）. Reduce percent of repeated insemination from 36% to 18.5% in a commercial pig farm is a notable effect. The number of weaned piglets/litter is not significantly different between control and supplemented groups （10.54 piglets versus 10.63, p 〉 0.05）. Weaned litter weight was 85.2 kg in control group and 83.4 kg in the supplemented group （p 〉 0.05）. It concludes that these are sound arguments to supplement all sows on commercial farm with BioPlus 2B.