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Effect of replacing conventional feeds with tropical agricultural by‐products on the growth performance, nutrient digestibility and ruminal microbiota of water buffaloes
Author(s) -
Huang Jinhua,
Wu Tingting,
Sun Xuezhao,
Zou Caixia,
Yang Yingbai,
Cao Yanhong,
Yang Yunyan,
Wasim Iqbal Muhammad,
Lin Bo
Publication year - 2020
Publication title -
journal of animal physiology and animal nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.651
H-Index - 56
eISSN - 1439-0396
pISSN - 0931-2439
DOI - 10.1111/jpn.13358
Subject(s) - bran , propionate , chemistry , dry matter , nutrient , soybean meal , food science , palm kernel , neutral detergent fiber , zoology , biology , agronomy , biochemistry , raw material , organic chemistry , palm oil
Abstract This study investigated the effect of replacing corn grain, soybean meal and wheat bran with tropical agricultural by‐products, such as palm kernel cake (PKC), cassava residue and dried distiller's grain with solubles (DDGS), on the dry matter intake (DMI), growth performance, apparent nutrient digestibility, ruminal short‐chain fatty acids (SCFA) and ruminal microbial communities of water buffaloes. Thirty healthy 15‐month‐old crossbred water buffaloes with a similar initial body weight of 353.1 ± 23.7 kg were randomly allocated into three dietary experimental groups, and they were fed with same forage but three different concentrates for 50 days fattening. The dietary treatments were as following: typical concentrate (TC, 65% corn + 15% wheat bran + 15% soybean meal), partial replacement concentrate Ⅰ (PRC I, 50% corn + 22.5% corn gluten + 22.5% PKC) and partial replacement concentrate Ⅱ (PRC II, 50% corn + 22.5% cassava residue + 22.5% DDGS). The results showed that the average daily gain of the PRC II group was the highest, and the DMI, acid detergent fibre digestibility and neutral detergent fibre digestibility value of the three groups were different and in the following order: PRC II group > TC group > PRC I group. The crude protein digestibility of PRC II was higher than that of the TC and PRC I groups (p < .05). The ruminal concentrations of total SCFA, acetate, propionate and butyrate of TC group were higher than the other two groups (p < .05). The PRC I group had the highest Bacteroidetes‐to‐Firmicutes ratio (B/F) and relative abundance of the genus Prevotella , while the PRC II group had the lowest B/F and relative abundance of Prevotella . In conclusion, using PKC and corn gluten to completely replace common feed ingredients in the buffalo concentrate ration decreased, while using cassava residue and DDGS increased animal growth performance, mainly due to the different combination influenced nutrient digestibility and ruminal microbial community composition was shifted.