ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2019, Vol. 50 ›› Issue (4): 758-770.doi: 10.11843/j.issn.0366-6964.2019.04.009

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Effects of Dietary Defatted Rice Bran Substitute Corn Levels on Growth Performance, Intestinal Development and Apparent Digestibility of Nutrients of Suhuai Pigs

PU Guang1,2, HUANG Ruihua1,4, NIU Qing1,2, WANG Huan1,2, FAN Lijuan1,2, GAO Chen1,2, NIU Peipei2, ZHANG Zongping2, WU Chengwu2, ZHOU Juan3, LI Pinghua1,4,5*   

  1. 1. Institute of Swine Science, Nanjing Agricultural University, Nanjing 210095, China;
    2. Huaian Academy, Nanjing Agricultural University, Huaian 223001, China;
    3. Huaiyin Pig Breeding Farm of Huaian City, Huaian 223322, China;
    4. Industrial Technology System Integration Innovation Center of Jiangsu Modern Agriculture(PIG), Nanjing 210095, China;
    5. Nanjing Agricultural University's New Rural Research and Development Corporation of Huaian City, Huaian 223001, China
  • Received:2018-08-16 Online:2019-04-23 Published:2019-04-23

Abstract:

The aim of this study was to investigate the effects of defatted rice bran substituting corn levels on growth performance, intestinal development and nutrient apparent digestibility of Suhuai pigs, and select the optimal level of defatted rice bran substituting corn for Suhuai pig.Thirty-five healthy Suhuai castrated boars with similar body weight at (62.90±0.78) kg were selected and randomly divided into 5 treatments (control group, group Ⅰ-Ⅳ) with 7 duplicates for 1 per duplicate. The pre-feeding period of the trial was 10 days and all pigs were fed with the same control diet ad libitum. The pigs in control were provided control diet without defatted rice bran, and the pigs in group Ⅰ-Ⅳ were provided diets that using 7%, 14%, 21%, 28% of defatted rice bran replaced the equivalent corn respectively for 28 days during the experiment period. The neutral detergent fiber (NDF) levels in the 5 groups were 8.89%, 11.80%, 12.93%, 14.35% and 17.94%, respectively. All pigs were provided diets and water ad libitum. The feed intake and body weight of all pigs were recorded daily during the experiment period. The fecal samples were collected on the 0th and 14th day of the experiment period, and the rectal contents were collected on the 28th day of the experiment period, which were used for the determination of apparent digestibility of nutrients. All pigs were slaughtered on the 28th day of the experiment period, and the weight and length of the gastrointestinal tract were measured. The results showed that:1) No significant difference was observed in the initial body weight, body weight of 14th of the experiment period, terminal body weight, average daily feed intake (ADFI), average daily gain (ADG), average daily gain from 0th to 14th day of the experiment period, average daily gain from 14th to 28th day of the experiment period and feed to gain ratio (F/G) among the 5 treatments(P>0.05). However, the average daily gain from 14th to 28th day were significantly higher than that from 0th to 14th day in control group and group Ⅰ-Ⅳ (P<0.05). The growth curve showed that the inflection points of the growth of the pigs in each group were 18.51th day(75.87 kg), 15.92th day(73.61 kg), 17.39th day(75.91 kg), 17.58th day(75.45 kg), 16.29th day(76.15 kg), respectively. Compared with the control group, pigs in the experimental groups reached the inflection point of growth earlier but there was no obvious difference in the growth trend among different groups. 2) Diets with different fiber levels had no significant effect on the relative length and weight of gastrointestinal tract, ratio of large intestine's weight and length to intestinal tract (P>0.05). 3) On the 14th and 28th day of the experiment period, with the dietary fiber level increased, no significant difference was observed in the apparent digestibility of NDF among the 5 treatments(P>0.05). The apparent digestibility of acidic detergent fiber (ADF) and crude protein (CP) decreased (linear, quadratic and cubic, P<0.01). On the 14th day, the apparent digestibility of ether extract (EE) had a decreased trend (quadratic, P<0.10). 4) According to the prediction of cubic curve regression model, the appropriate levels of defatted rice bran substituting corn were 12.77% and 14.78% respectively, when the apparent digestibility of ADF and CP were considered as dependent variance. When the digestive energy and CP of 5 diets were the same and enough, increasing dietary fiber level had no siginficant effect on growth performance, relative intestinal weight and length, apparent digestibility of NDF, but decreased the apparent digestibility of ADF and CP. The defatted rice bran substituting part of the corn was feasible, the optimal ratio was 12.77%.

Key words: Suhuai pig, growth performance, intestinal tract, digestibility

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