Energy, protein and fibre digestibility of sunflower hulls, olive leaves and NaOH-treated barley straw for rabbits
Abstract
One hundred and sixty nine New Zealand White x Californian rabbits were used to determine the nutritive value of sunflower hulls, olive leaves and NaOH-treated barley straw. These feedstuffs were substituted at 6, 12, 18 and 24% in a basal diet formulated for a high energy and protein content. Digestible energy (DE) values calculated by difference for the highest substitution levels (18 and 24%) were 4.77(±0.32), 6.16(±0.37) and 4.10(±0.32) MJ kg· DM for sunflower hulls, olive leaves and NaOH-treated barley straw, respectively. Standard errors of these estimations decreased with level of substitution (by 83% on average from 6 to 24% of inclusion level). Crude protein digestibility values obtained were not consistent due to its high standard errors (±48 as average). The values estimated for neutral detergent fibre digestibility (%) were relatively low and had also high standard errors: 10.7(±5.70); 7.76(±7.89) and 5.76(±6.14) for sunflower hulls, olive leaves and NaOH-treated barley straw, respectively. An stepwise regression equation to predict DE value of fibrous feeds was developed from data of this work and from literature using as independent variables ash, CP, crude fibre (CF), ether extract (%DM) and gross energy. The equation obtained was: DE (MJ kg-1 DM)= 14.46 (±1.10) - 0.23(±0.032) CF (R2=0.781; RSD=1.43; P<0.001 ).
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1. Effect of substituting guinea grass with sunflower hulls on production performance and digestion traits in fattening rabbits
G.Y. Liu, C.R. Sun, X.Y. Zhao, H.L. Liu, Z.Y. Wu, F.C. Li
World Rabbit Science vol: 26 issue: 3 first page: 217 year: 2018
doi: 10.4995/wrs.2018.9375
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Official journal of the World Rabbit Science Association (WRSA) | |
e-ISSN: 1989-8886 ISSN: 1257-5011 https://doi.org/10.4995/wrs |