title: Effects of dietary lysine levels on apparent nutrient digestibility and cationic amino acid transporter mRNA abundance in the small intestine of finishing pigs, Sus scrofa.
abstract: One hundred and twenty pigs were used to evaluate the effects of different dietary lysine levels on the growth performance, apparent nutrient digestibility, and abundance of cationic amino acid transporter messenger RNA (mRNA) in the small intestine of finishing pigs. Pigs received a low lysine diet (LL, 0.60% lysine), moderate lysine diet (ML, 0.80% lysine) or a high lysine diet (HL, 1.00% lysine) for 28 days. A digestion test was carried out during the third week. Although the apparent nutrient digestibility in pigs fed experimental diets were different (P < 0.05) and the highest when pigs were fed ML diet, diets did not change the growth performance. In the duodenum, mRNA abundance of PepT-1, as detected by real-time RT-PCR, was reduced in the LL diet (P < 0.05). A greater abundance of b(0,+) AT and PepT-1 mRNA was associated with the ML diet (P < 0.05) in the jejunum and ileum, respectively. In the ileum, the HL diet had a lower abundance of CAT-1 mRNA compared with other diets. These results showed that the finishing pigs would gain better nutrient digestibility when the dietary lysine content was 0.80%, and dietary lysine levels influenced the expression of cationic amino acid transporter mRNA in the small intestine of finishing pigs.
authors.affiliation: Department of Animal Science, South China Agricultural University, Guangzhou, China. xqwang@scau.edu.cn
authors.forename: Xiu-Qi
authors.initials: XQ
authors.lastname: Wang
authors.forename: Pei-Ling
authors.initials: PL
authors.lastname: Zeng
authors.forename: You
authors.initials: Y
authors.lastname: Feng
authors.forename: Chang-Ming
authors.initials: CM
authors.lastname: Zhang
authors.forename: Jing-Pei
authors.initials: JP
authors.lastname: Yang
authors.forename: Gang
authors.initials: G
authors.lastname: Shu
authors.forename: Qing-Yan
authors.initials: QY
authors.lastname: Jiang
mesh_terms: D026923:Amino Acid Transport Systems, Basic / Q000235:genetics / Q000378:metabolism*; D000821:Animal Feed / Q000032:analysis; D000824:Animal Nutritional Physiological Phenomena / Q000502:physiology*; D000818:Animals; D019587:Dietary Supplements / Q000032:analysis; D004063:Digestion / Q000502:physiology*; D007421:Intestine, Small / Q000378:metabolism*; D008239:Lysine / Q000008:administration & dosage*; D012333:RNA, Messenger / Q000378:metabolism*; D034421:Sus scrofa / Q000254:growth & development / Q000378:metabolism*
chemical_list: D026923:Amino Acid Transport Systems, Basic; D012333:RNA, Messenger; D008239:Lysine