| In order to explore the possibility of aerosol OT (AOT) and paraformaldehyde (PFD) improving intake and digestion and metabolism in late pregnant ewe, this paper studied on the effects of the supplement of AOT or PFD on the intake, digestion and metabolism in late pregnant sheep by feeding experiment, digestion and metabolism experiment and determination of blood biochemical indices and etc, so as to provide relevant theoretical and practical guidance for lambing ewes production.36 pregnant Small Tail Han sheep ewes, carring with the prolificacy gene, about 3 years old and weight matched (average weight was 49.4±2.3 kg) were selected and randomly divided into 6 groups (6 rats in each group.) according to body weight. Their diets were ground cornstalk diet (consisting of cornstalk+mixed concentrate) and pelletized cornstalk diet (pressed ground cornstalk diet into pellets), two kinds of dietary concentrate to forage ratio were 31.7:68.3.6 groups of sheep were fed with ground cornstalk diet from the 1 month before mating to 90 days of pregnancy, and were fed with different diets from 91 days of pregnancy until birth:the first group was ground cornstalk diet (the ground cornstalk diet control group), the second group was ground cornstalk diet+AOT (800mg/kg of diet, as DM basis, the same below; the ground cornstalk diet AOT group), the third group was ground cornstalk diet+300mg/kg PFD (the ground cornstalk diet PFD group), the fourth group was pelletized cornstalk diet (the pelletized cornstalk diet control group), the fifth group was pelletized cornstalk diet+ 800mg/kg AOT (the pelletized cornstalk diet AOT group), the sixth group was pelletized cornstalk diet+ 300mg/kg PFD (the pelletized cornstalk diet PFD group).The sheep were made intake and digestion and metabolism experiments during the pregnancy of 121d-130d, were detected blood biochemical indexes in the pregnancy of 131d and, were weighed, recorded postpartum weight of ewes and lamb birth weight.The results showed that in the condition of feeding AOT in late-pregnant sheep (121d-130d) with ground diet, the voluntary intake of dry matter was increased by 13%(P<0.01), the apparent digestibility of dry matter, organic matter, crude protein, cellulose and gross energy had no significant effect (P> 0.05), but their amount of digestion was increased by 12.4%(P<0.05),14.4%(P<0.07),23.2%(P<0.07),15.2%(P> 0.05) and 27.4%(P<0.01) respectively, the retention of nitrogen, calcium and phosphorus was increased by 31.1%(P<0.01),48.5%(P<0.0i)and 31.9%(P<0.01) respectively, the loss of ewe postpartum weight was reduced by 61.9%(P<0.0i), a nest of lamb weight was increased by 4.2%(P>0.05); Feeding AOT in late-pregnant sheep (121d-130d) with pelletized diet, the voluntary intake of dry matter was increased by 19.8%(P<0.05), the apparent digestibility of dry matter, organic matter, crude protein, cellulose and total energy had no significant effect (P>0.05), but their amount of digestion was increased by 28.5%(P<0.05),30.0%(P<0.05),21.8%(P<0.01),7.0%(P>0.05) and 20.1%(P<0.05) respectively, the retention of nitrogen, calcium] and phosphorus was increased by 38.4%(P<0.01),17.9%(P<0.01) and 13.0%(P<0.05) respectively, the gaining weight of ewe postpartum weight was increased by 82.4%(P<0.01), a nest of lamb weight was increased by 12.2 (P<0.01).The results showed that in the condition of feeding PFD in late-pregnant sheep (121d-130d) with ground diet, the voluntary intake of dry matter was increased by 12.6%(P<0.01), the apparent digestibility of dry matter, organic matter, crude protein, cellulose and gross energy had no significant effect (P> 0.05), but their amount of digestion was increased by 15.4%(P<0.01),16.2%(P<0.01),22.4%(P<0.01),14.2%(P>0.05) and 29.0%(P<0.01) respectively, the retention of nitrogen, calcium and phosphorus was increased by 33.5%(P<0.01),48.9%(P<0.01)and 36.3%{P<0.01) respectively, the loss of ewe postpartum weight was reduced by 57.1%(P<0.01), a nest of lamb weight was increased by 11.1%(P<0.05); Feeding PFD in late-pregnant sheep (121d-130d) with pelletized diet, the voluntary intake of dry matter was increased by 24.4%(P<0.05), the apparent digestibility of dry matter, organic matter, crude protein, cellulose and total energy had no significant effect (P>0.05), but their amount of digestion was increased by 32.1%(P<0.05),30.5%(P<0.05),21.6%(P<0.01),5.8%(P>0.05) and 15.3%(P>0.05) respectively, the retention of nitrogen, calcium and phosphorus was increased by 38.9%(P<0.01),22.3%(P<0.01) and 14.2%(P<0.05) respectively, the gaining weight of ewe postpartum weight was increased by 88.2%(P<0.01), a nest of lamb weight was increased by 13.5 (P<0.01).From the above results, the conclusion was that feeding AOT or PFD can significantly improve voluntary intake, has no significant effect on the apparent digestibility of dry matter, crude protein and etc, but significantly increase digestion of dry matter, organic matter, crude protein, calcium and phosphorus, increase retention of nitrogen, calcium and phosphorus; has no significant effect on blood glucose, triglyceride, beta hydroxybutyric acid and free fatty acid concentration; it can improve the nutritional status of pregnant ewes, increase a nest of lamb weight, does not affect the survival rate. |
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