Effects of Valgus-varus Deformity on Growth Performance, Serum Biochemical Indicators and Bone Morphometry in Broilers (Gallus gallus) at Different Stages
GUO Ya-Ping, TANG He-He, WANG Xiang-Nan, FU Ya-Wei, CHEN Yi, LI Zhuan-Jian
College of Animal Science and Veterinary Medicine, Henan Agricultural University/Henan Innovative Engineering Research Center of Poultry, Zhengzhou 450002, China
Abstract The large economic losses caused by leg disorders have raised concerns in the broiler (Gallus gallus) industry. Valgus-varus deformity (VVD) is an outward or inward angulation of the intertarsal joint tibiotarsal bone that results in deviation of the tarsometatarsus. The growth performance and the serum biochemical indicators of VVD broilers and normal broilers were measured at 18, 28 and 38 d. And the bone morphometry of VVD broilers and normal broilers was measured at 28 and 38 d. The results showed: 1) Body weight, shank length and girth of the VVD broilers were significantly or extremely significantly lower than those of normal birds at 18, 28 and 38 d (P＜0.05 or P＜0.01). 2) Compared with normal broilers, the contents of triglyceride (TG) (28 and 38 d) and high density lipoprotein cholesterol (HDL-C)(18 and 38 d) were significantly or extremely significantly lower in VVD groups (P＜0.05 or P＜0.01). The total cholesterol (T-CHO) content (18 d) and low density lipoprotein cholesterol (LDL-C)(18, 28 and 38 d) were significantly or extremely significantly higher in broilers with VVD than in normal birds (P＜0.05 or P＜0.01). 3) The serum Ca level was extremely significantly higher at 18 and 38 d (P＜0.01) in VVD groups.. The serum Ca, ALP (28 d) and the P (18 d) were significantly or extremely significantly lower at 28 d (P＜0.05 or P＜0.01) in VVD groups. Generally, VVD resulted in decreased growth performance and abnormal changes in blood lipid, serum calcium, serum phosphorus and serum alkaline phosphatase levels in broilers. The aim of this study was to explore the effects of VVD on growth performance, serum content and bone morphometry in broiler, to provides reference for study of VVD and leg health in broiler.
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