LYSINE SUPPLEMENTATION IMPROVES NUTRIENTS DIGESTION, GROWTH PERFORMANCE AND LIVER FUNCTION OF FEMALE BLUE FOXES (Alopex lagopus) IN GROWING PHASE
Q. Jiang1.2, F. Yang1, X. Gao3 and X. Wu2*
1Institute of Special Animal and Plant Sciences, State Key Lab for Molecular Biology of Special Economic Animals, Chinese Academy of Agricultural Sciences, Changchun City, Jilin, China.
2 College of Animal Science, Anhui Science and Technology University, 1501 Huangshan Avenue, Bengbu, Anhui, China.
3 Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing, China.
* Corresponding author: Xuezhuang Wu: firstname.lastname@example.org
The present study investigated the effects of lysine supplementation in low-protein diets on nutrients digestibility, growth performance and healthy status of growing female blue foxes (Alopex lagopus). Control animals were fed a diet containing normal protein level (32% of dry matter, DM). Animals in the treatment groups were challenged with low-protein diets supplemented with 0.00%, 0.20%, 0.40%, 0.60%, 0.80% and 1.00% lysine, corresponding to 0.87%, 1.07%, 1.27%, 1.47%, 1.67% and 1.87% total lysine of DM, respectively. Results showed that 1.47% lysine supplementation exerted beneficial effects (P < 0.05) on blue foxes, as evidenced by improved digestibility of crude protein (CP) and several amino acids (aspartic acid, glycine, methionine, isoleucine and tyrosine). Similar effect was observed in N retention (P < 0.05) and the growth performance (P < 0.05). Additionally, the 0.87% lysine group exhibited a significant decrease in blood albumin (ALB) as opposed to the other groups (P < 0.01). Collectively, these findings indicate that quality of low-protein diet can be improved by supplemented lysine without influencing health of female blue foxes at the growing phase. The optimum lysine for maximum performance and low N emission of the growing female blue foxes in approximately 1.47% of DM.
Key words: lysine, low protein diets, female blue foxes, growing phase, growth performance