| 1 | The use of feed-grade amino acids in lactating sow diets显示文摘Background: The use of feed grade amino acids can reduce the cost of lactation feed. With changing genetics,increasing feed costs, and higher number of pigs weaned with heavier wean weights further evaluation of higher inclusion levels of feed-grade amino acid in lactation diets than previously published is warranted. Two experiments(Exp.) were conducted to determine the optimal inclusion level of L-lysine HCl to be included in swine lactation diets while digestible lysine levels remain constant across dietary treatments and allowing feed grade amino acids to be added to the diet to maintain dietary ratios relative to lysine to maximize litter growth rate and sow reproductive performance. Furthermore, the studies were to evaluate minimal amino acid ratios relative to lysine that allows for optimal litter growth rate and sow reproductive performance.Results: Exp. 1: Increasing L-lysine HCl resulted in similar gilt feed intake, litter, and reproductive performance.Average litter gain from birth to weaning was 2.51, 2.49, 2.59, 2.43, and 2.65 kg/d when gilts were fed 0.00, 0.075,0.150, 0.225, and 0.30% L-lysine HCl, respectively. Exp. 2: The average litter gain from birth to weaning was 2.68,2.73, 2.67, 2.70, and 2.64 kg/d(P < 0.70) when sows were fed 0.1, 0.2, 0.3, 0.4, and 0.4% L-lysine HCl plus valine,respectively. No other differences among dietary treatments were observed.Conclusions: Collectively, these studies demonstrate corn-soybean meal based lactation diets formulated with a constant SID lysine content for all parities containing up to 0.40% L-lysine HCl with only supplemental feed grade threonine and a methionine source have no detrimental effect on litter growth rate and subsequent total born. | Laura Greiner Pairat Srichana James L.Usry Casey Neill Gary L.Allee Joseph Connor Kevin J.Touchette Christopher D.Knight | 2018 | Journal of Animal Science and Biotechnology2018，9，2： | 0 |
| 2 | 仔猪氨基酸营养显示文摘如今仔猪对于氨基酸的需求越来越受到人们的关注,多项研究表明,氨基酸的需求量,尤其是赖氨酸的需求量远远高于NRC(1998)的标准。NRC(1998)与目前研究结果出现差异的原因可能是由于当前的基因型猪比以前的基因型猪生长速度更快、蛋白沉积更多。鉴于当前仔猪对赖氨酸需求量增加的现状,根据理想蛋白质模式,可以推断:仔猪对其他氨基酸的需要量也会增加。因而,在过去的数年里,人们做了大量研究来重新评估当前仔猪生长所需的必需氨基酸的需求量。 | Gary L.Allee | 2012 | 饲料工业2012，33，8： | 0 |
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