DIGESTIBILITY, NITROGEN BALANCES AND ENERGY METABOLISM IN PIGLETS RAISED ON SOYAPROTEIN CONCENTRATE
- VernacularTitle:饲喂仔猪以大豆浓缩蛋白质流体日粮的消化率、氮平衡与能量代谢
- Author:
Zhong HUANG
- Publication Type:Journal Article
- From:
Acta Nutrimenta Sinica
1956;0(02):-
- CountryChina
- Language:Chinese
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Abstract:
1. A trial with 4 pairs of piglets (litter mates) fed a synthetic diet ba- sed on 25% purified soya protein concentrate, Danpro-A, 25% soluble ma ize starch, 14.6% glucose, 12.0% lactose, 5% soya oil and 5% lard without (diet A) or with a supplement of 0.2% DL-methionine (diet B) has been carried out. The piglets were kept individually in metabolic crates during the whole experimental time from 7 to 56 days of age. By means of bottles with lambteats they could suck their liquid diet at any time. Five to six consecutive balances were carried out with each piglet in order to measure the digestibility, metabolizability, nitrogen balances and energy metabolism (Indirect calorimetry, open-air respiration chambers).2. No significant differences were found concerning feed intake or live weight gain between the piglets on diet A or B.3. The digestibility of dry matter, organic matters, nitrogen and energy together with the metabolizability (ME/GE) were significantly lower for piglets below 4 weeks of age than above that age where a high digestibility and metabolizability of about 95% were obtained with no significant difference between diet A and B.4. The intake of nitrogen was kept relatively low (17.4% crude protein in the diets) in order to measure any differences in the nitrogen metabolism which might occur by adding methionine. With the low nitrogen intake the nitrogen retention was a linear function of digested nitrogen. No significant difference was found between diet A and B, The pooled data gave a regression of RN = -0.524 + 0.829 DN5. Energy retention in relation to total ME gave a regression coefficient of 0.436 with no significant difference between diet A and B.6. The proportion between energy gain in fat and protein was fairly constant about 1.4 during the experimental time with no significant difference between diet A and B.7. The daily maintenance requirement was found to be 575KgJ/kg0.75 with no significant difference between the diets.8. The net availability of ME for growth, Kg, was high 0.767 but the accuracy of the estimate was low with CV=14.6%.9. The hige digestibility of nitrogen, the high utilization of digested nitrogen and the high value of Kg indicate that a soya protein concentrate as Danpro-A can be used as the only protein source in a sowmilk substitute. Adding 0.2% DL-methionine to the diet has not improved the results.
