This experiment was conducted to evaluate the growth performance, fecal score, and fecal microbial shedding in weaning pigs fed diets with different levels of fiber and protein. A total of 96 weaning piglets (7.41 ± 0.71 kg) were used in a 5-week trial. Pigs were allotted to dietary treatments based on initial body weight in a 2 × 2 factorial design with the following factors: dietary fiber (100 and 200 g/kg, respectively, during days 0 to 14; 175 and 300 g/kg, respectively, during days 14 to 35) and dietary protein (170 or 200 g/kg). There were 6 replicates with 4 pigs per pen. On day 14, pigs fed high protein or high fiber diets had heavier body weight (p < 0.05). During days 0 to 14, pigs fed high protein or high fiber diets grew faster (p < 0.05). Additionally, during days 14 to 35, an interactive effect of fiber and protein was found (p < 0.05) on average daily gain. The different levels of protein and fiber in diet did not affect the pigs' fecal scores (p > 0.05). However, feces from the high fiber group showed lower concentration of Escherichia coli (p < 0.05). In conclusion, the results of the present study indicate that a high protein diet improves the growth of weaning pigs especially during the first two weeks. Moreover, the increments in fiber level, even in the high protein diet, favorably decreased the number of E. coli.
Sampling and measurementsIndividual pig weight was measured at the beginning, day 14, and day 35 of the experimental period, and feed consumption was recorded on a pen basis to calculate average daily gain (ADG), average daily feed intake (ADFI), and gain : feed ratio. Effect of different levels of fiber and protein on growth performance and fecal characteristics in weaning pigs Korean Journal of Agricultural Science 44(3) September 2017 x Provided per kg of complete diet:11,000 IU of vitamin A; 1,051 IU of vitamin D3; 50 U of vitamin E; 3 mg of vitamin K; 3 mg of vitamin B1; 8 mg of vitamin B2; 6 mg of vitamin B6; 33 µg of vitamin B12; 35 mg of pantothenic acid; 50 mg of niacin; 0.03 mg of biotin. y Provided per kg of complete diet: 150 mg of Cu; 125 mg of Fe; 150 mg of Zn; 75 mg of Mn; 0.5 mg of I; 0.5 mg of Co; 0.3 mg of Se. z SID: standard ileal digestible basis.Effect of different levels of fiber and protein on growth performance and fecal characteristics in weaning pigs