Ho Trung Thong, Htoo John Khun Kyaw, Dao Thi Binh An, Carpena Maria Eloisa, Le Nu Anh Thu, Vu Chi Cuong, Nguyen Quang Linh
Faculty of Animal Sciences and Veterinary Medicine, College of Agriculture and Forestry - Hue University, Hue, Vietnam.
Evonik Nutrition & Care GmbH, Hanau, Germany.
J Anim Physiol Anim Nutr (Berl). 2019 Jan;103(1):258-268. doi: 10.1111/jpn.13029. Epub 2018 Nov 22.
Two experiments were conducted to determine the standardized ileal digestible (SID) lysine (Lys) requirement and the ideal SID sulphur amino acids (SAA) to Lys ratio for 30-50 kg crossbred pigs. In experiment 1, a total of 72 crossbred pigs with an average initial body weight (BW) of 28.9 kg were allotted to one of six dietary treatments in a randomized complete block design. Each diet was assigned to six pens containing two pigs each. Six diets were obtained by supplementing graded levels of L-Lysine∙HCl to create six dietary levels of SID Lys (0.70%, 0.80%, 0.90%, 1.00%, 1.10% and 1.20%). Responses of weight gain (ADG) and gain:feed (G:F) to increasing the SID Lys content of the diet fitted well with the curvilinear-plateau model; whereas, for plasma urea nitrogen (PUN) two-slope linear broken-line model was well fitted. The optimal SID Lys requirement for the pigs of this period was 1.10%. Experiment 2 was a dose-response study using SID Met+Cys to Lys ratios of 50%, 55%, 60%, 65%, 70% and 64%. A total of 72 crossbred pigs with initial BW of 32.9 kg were randomly allotted to receive one of the six diets. Diets 1-5 were formulated to contain 1.0% SID Lys to be second limiting in Lys and diet 6 contained 1.11% SID Lys to be adequate in Lys. The average optimal SID SAA:Lys ratio for maximal ADG and G:F and minimal PUN was 65.2% using curvilinear-plateau and linear broken-line models.
进行了两项试验，以确定30至50千克杂交猪的标准回肠可消化（SID）赖氨酸（Lys）需要量以及理想的SID含硫氨基酸（SAA）与Lys的比例。在试验1中，将72头平均初始体重（BW）为28.9千克的杂交猪，按照随机完全区组设计分配到六种日粮处理之一。每种日粮分配到六个猪栏，每个猪栏饲养两头猪。通过添加梯度水平的L-盐酸赖氨酸来配制六种日粮，以创建六个SID Lys日粮水平（0.70%、0.80%、0.90%、1.00%、1.10%和1.20%）。随着日粮SID Lys含量增加，体重增加（ADG）和增重：饲料比（G:F）的反应与曲线-平台模型拟合良好；而血浆尿素氮（PUN）则与双斜率线性折线模型拟合良好。此阶段猪的最佳SID Lys需要量为1.10%。试验2是一项剂量反应研究，使用的SID Met+Cys与Lys比例为50%、55%、60%、65%、70%和64%。将72头初始体重为32.9千克的杂交猪随机分配，以接受六种日粮中的一种。日粮1至5配制为含有1.0%的SID Lys，为第二限制性氨基酸，日粮6含有1.11%的SID Lys，Lys含量充足。使用曲线-平台模型和线性折线模型，得出最大ADG和G:F以及最低PUN时的平均最佳SID SAA:Lys比例为65.2%。
