Abstract #M232

# M232
Effect of pasteurized and non-pasteurized colostrum on the growth performance and development of gastrointestinal tract of calves.
G. T. Liu1,2, D. P. Bu1,5, S. C. Li3, K. Yang4, Q. E. Zhang*2, 1State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China, 2Department of Animal Science, Ningxia University, Yinchuan, Ningxia, China, 3Department of Animal Science, University of Manitoba, Winnipeg, Canada, 4Dongying Austasia Modern Dairy Farm Co.,Ltd, Dongying, Shandong, China, 5Hunan Co-Innovation Center of Safety Animal Production , CICSAP, Changsha, Hunan, China.

The effects of colostrum pasteurization on the growth and gastrointestinal tract of calves were studied. Twenty newborn Holstein calves were randomly divided into 2 groups (n = 10) and were rasied in individual pens. Calves were either fed non- pasteurized colostrum (NPC) or pasteurized colostrum (PC) processed at 60°C for 60 min using a Dairy Tech colostrum pasteurizer (Dairy Tech Inc., Colorado). All calves were offered 4 L of colostrum within 1 h after birth and given a second feeding of 2 L of colostrum 6 h later. The experiment was carried out over 90 d. Measurements of the body weight, body length and metatarsal circumference of the calves were recorded every 30 d during the trial, while the dietary intake and diarrhea frequency were measured daily. Five calves from each group were randomly selected and slaughtered at 90 d of age. The dorsal sac and ventral sac of the rumen and small intestine were sampled to make paraffin sections and then observed its morphological changes. A repeated measures analysis was conducted by using the MIXED procedure of SAS while Initial body weight was included as a covariate in the model when appropriate. The calves in PC group had higher (P < 0.05) metatarsal circumference and tended to have longer (P = 0.09) body length at 90 d of age (Table 1). Colostrum type had no effect on the intake of starter feed and diarrhea frequency. However, the papilla width of rumen dorsal sac (1.25 vs. 1.02 mm) and rumen ventral sac (1.18 vs. 0.96 mm), the villus height of duodenum (0.55 vs. 0.43 mm) and jejunum (0.64 vs. 0.46 mm) in PC group were greater(P < 0.05) than that in NPC group, and the crypt depth of jejunum (0.39 vs. 0.49 mm) were smaller (P < 0.05). The results indicate that the pasteurized colostrum has a positive impact on the growth performance and development of gastrointestinal tract for calves in 90 d of age. Table 1. Body weight (BW), body length (BL), and metatarsal circumference (MC) data
0 d30 d60 d90 d0 d30 d60 d90 dTrtDayTrt × day
BW (kg)<0.00010.75
BL (cm)71.178.890.099.369.878.389.9100.70.60.81<0.00010.09
MC (cm)11.612.214.014.911.612.<0.00010.02

Key Words: calf, pasteurized colostrum, growth