| The experiment was conducted to study the effect of raw soybean on sow' reproductivity.18 sows (nine Landrace sows, nine Songliaohei sows ) were randomly divided to 3 groups, and each group contained 6 sows (three Landrace sows, three Songliaohei sows). During the gestation, the first group of sows were fed on diet containing raw soybean (RS), the second group of sows were fed on diet containing soybean meal(SBM), the third one were fed on the diet containing corn gluten meal (CGM). The sows' weight were determined after childbirth and the 108th day, and the colostrum and the milk were taken at first day and 5th day, respectively. At the same time, the blood sample were taken from the sows to measure the concentration of the Anti-soy IgG. Complementary prestarter were offered to the piglets from day 7, and all piglets were fed on the same diet, according to the arrangment of trial, the piglets were weaned at the age of 35, the experiment was ended at the day 63. At the week of 5 7 9, body weight and consumption of the diets were determined to calculated the average daily gain(ADG) and feed/gain(F/A). .At the age of 42 and 56, blood sample were taken from the piglets for measured the concentration of IgG, furthermore, at the age of 42, skin-fold thickness was measured at day 42 in order to determine the piglets' immunity .The results indicated that there were no significant difference among the different sows fed on three diets with litter size, birth weight, the litter weight at the age of 20 days and the survival rate at weaning (p>0.05) in the same breed. Between the two breeds, at the age of 20 days, the litter weight of Landrace piglet was greater than that of Songliaohei piglet (p<0.05). The weight of Landrace piglets at weaning was greater than that of Songliaohei piglet (P<0.01), however, there was no difference in the change of body weight of sows during the gestation within the same breed. (p>0.05). The change of body of Landrace sow was 0.64Kg higher than that of Songliaohei sow(p<0.01).In the same breed, the piglets' ADG and F/G were similar(p>0.05), Landrace piglets had a higher ADG that of Songliaohei piglet at the week of 0-5(p>0.05), moreover, during 5-7 and 7-9 week, all the piglet had the similar F/G(p>0.05). There was no difference in the incidence of the diarrhea of the piglets within the same breed at weaning and post-weaning (p>0.05), the incidence of diarrhea for Landrace piglet was higher than that of Songliaohei piglet (p<0.01).The result of skin test shown that there was no significant difference in the skin-fold thickness in the same breed sows fed on different diets, the skin-fold thickness of the Landrace piglet was higher than that of Songliaohei piglet (p<0.01), which indicated Landrace piglet might be more sensitive than Songliaohei piglet.The concentration of the Anti-IgG of colostrums were similar in the same breed sows fed on different diets, similarly, concentration of Anti-IgG of milk had the same results, reversely, the concentration of the Anti-IgG in colostrums or milk of Landrace sows were higher than that Songliaohei sows(p>0.05). There was same concentration of Anti-soy IgG in the colostrums or milk of the sows which were fed on the diet without any soy, the result of cross reactivity trial indicated that the Anti-soy was the same type, yet.Some Conclusions could be drawn that if raw soy were used for the main or unique protein source in the sow's diet, there were no any negative effects on the litter size, birth weight, lactating ability, and so on. the skin-fold thickness of Landrace piglet was higher than that of Songliaohei piglet, Landrace piglet was more sensitive to soy than that of Songliaohei piglet. Anti-soy IgG to Glycinin in the colostrums or milk was higher than that of β -Conglycinin, maybe, the conclusion could be draw that Glycinin had stronger influence than β -Conglycinin on piglets' immunity. The concentration of the Anti-Soy IgG in the colostrums had little influence on the performance of the piglets. |
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