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 《Amino Science》Vol. 2 Dec. 2008
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| Factors influencing the study of Tryptophan requirement in pigs （色氨酸需要量研究的影响因素） |
| 作者（Author）：Yang Qiang Liu Qian |
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摘要（Abstract）：
Due to many influencing factors, there is a large discrepancy among estimates of Tryptophan (Trp) requirement of pigs. this article provides theoretical basis for the application of Trp in practice by discusisng the factors influencing the study of Trp requirement of pigs including analyzing methods, research methodologies, assessment indices, nutrient level in diets, breeds and growth phase of pigs, environment and health status ets.
Key words: Tryptophan requirement influencing factors
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中文请参考《氨基酸科技》2008年第三期总第四期
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| Research progress on Tryptophan requirement of piglets and growing and finishing pigs （仔猪和生长育肥猪色氨酸需要量研究进展） |
| 作者（Author）：Lu Ning Liu Qian |
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摘要（Abstract）：
Bisides Lysine (Lys), Threonine (Thr) and Methionine (Met), Tryptophan (Trp) is considered as the fourth limited amino acid in swine feed and the second limited amino acid in corn-soybean meal diets with low protein level. As crystal Lys, Met and Thr are widely used in animal feed, the restriction effect of Trp on swine feed has become more obvious. This article has reviewed researches about the application of Trp in swine feed and provides theoretical basis to determine the proper Trp requirement for piglets, growing and finishing pigs.
Key Words : Tryptophan piglets growing and finishing pigs requirement
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中文请参考《氨基酸科技》2008年第三期总第四期
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The application of crystal amino acids in low protein diets of growing pigs （晶体氨基酸在生长猪低蛋白日粮中的应用研究）
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| 作者（Author）： Lu Ning Yi Xuewu Qiao Shiyan Liu Qian |
摘要（Abstract）：
The study of low protein diet has been developed since early 1960s. As the establishment of ideal amino acid (AA) pattern and industrialization of AA production, researches of low protein diets have been developed. Meanwhile, more researches of AA nutrition have been carried out due to the rapid rise of protein material prize, such as soybean meal. In this article, latest researches of AA nutrition in low protein diet which have been conducted in China as well as other countries are summarized. The discussion of the application of crystal AA in low protein diet in growing pigs is introduced from the points of view of growth performance and carcass quality.
Keywords:low protein diet crystal amino acid growth performance carcass quality
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中文请参考《氨基酸科技》2008年第二期总第三期
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| Effects of dietary true digestible Threonine levels on the growth performance, blood indices and immune functions of weaning piglets (日粮真可消化苏氨酸水平对断奶仔猪生产性能、血液参数和免疫功能的影响） |
| 作者（Author）： Wang Xu Liu Qian |
摘要（Abstract）：
This experiment has been conducted to study effects of different true digestible Threonine (Thr) levels on the growth performance, blood indices and immune functions of weaning piglets weighing 10-25 kg which were fed diets formulated based on true ileal digestibility of Thr measured by previous experiment. 90 barrows (Large White × Landrace) with the age of 28±2d and weight of 9.85±0.78 kg were used in this experiment and were allotted into 5 treatments, 6 replicates per treatment and 3 piglets per replicate. Piglets were fed diets with 5 different levels of true digestible Thr at 5.3, 5.8, 6.5, 7.5, 8.5 g/kg respectively. The duration of the experiment is 28 days. On Day 14, all piglets were administered intramuscular injection with albumin egg at 1 mg/kg BW. The concentration of serum anti albumin egg IgG was measured on Day 14, 21 and 28. The concentration of serum free amino acids and serum urea N were measured on Day 14 and 28. Results showed that in the whole experimental period, as the intake of true digestible Thr was increased, the daily weight gain (P = 0.047) and the feed conversion (P = 0.002) were improved, but the average daily feed intake was not affected (P = 0.822). When the intake of true digestible Thr was 5.9 g/d, the optimal daily weight gain and feed conversion were achieved. As the intake of dietary true digestible Thr was increased from 4.1 to 5.0 g/d, serum urea N was decreased (P = 0.009); while the serum urea N was increased (P = 0.001) as the intake was increased from 5.0 to 6.6 g/d. When the intake of dietary true digestible Thr was increased from 4.1 to 6.6 g/d, the concentration of serum free amino acids was increased (P = 0.001), but the concentration of serum free Histidine (His), Isoleucine (Ile) and Valine (Val) were decreased (P = 0.002). As the intake of dietary true digestible Thr was increased, the concentration of serum anti albumin egg IgG was increased and the highest concentration was achieved when the intake was 6.6 g/d. It can be concluded that the requirement of dietary true digestible Thr of 10-25 kg weaning piglets to achieve the optimal immune functions is higher than the requirement to achieve the optimal daily weight gain and feed conversion.
Keywords: true digestible Threonine growth performance immune functions serum urea nitrogen serum free amino acid weaning piglets
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中文请参考《氨基酸科技》2008年第一期总第二期
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