Abstract
Context Tannins are blamed for negatively affecting nutritive value of sorghum. Kafirins are sorghum storage proteins and may be associated with lower animal performance. They have been tested in poultry diets; however, information for pig diets is scarce. Aims Our aim was to determine the role of kafirins and tannins in sorghum nutritive value for swine. Methods Two experiments evaluated effects of sorghum tannin and kafirin levels on (1) nitrogen (N) and energy balance, and (2) performance of pigs. Two sorghum hybrids with low (LT) and high (HT) tannins were grown at two rates of N fertiliser to achieve low (LK) and high (HK) kafirins (i.e. four sorghum treatments: LTLK, LTHK, HTLK and HTHK) and added to soybean meal based diets. A fifth diet included maize instead of sorghum. Five pigs (48.8 ± 0.4 kg) were used in a 5 × 5 Latin square design to measure N and energy balance, with 5 days of diet adaptation and 4 days of urine and faeces collection. The performance experiment included 60 pigs (54.0 ± 12.4 kg, 30 barrows and 30 gilts, six of each per treatment) placed in individual pens with free access to water and feed. Key results Energy balance showed a tannin × kafirin interaction (P < 0.05) for dry matter feed intake, which diminished with the LTHK diet and was unaffected with the HTHK diet. Dry matter digestibility was higher (P < 0.001) with maize, intermediate with LT, and lower with HT diets. Pigs fed maize retained more N (P < 0.05) and had higher energy digestibility (P < 0.001) than pigs fed sorghum. HT diets had lower (P < 0.01) energy digestibility than LT diets. In the finishing phase, average daily feed intake showed a tannin × kafirin interaction (P < 0.05); pigs fed the HTHK diet had lower average daily feed intake than other pigs. This lowered average daily liveweight gain and consequently final weight. Conclusions Tannins negatively affected sorghum nutritive value; high kafirins worsened average daily feed intake and liveweight gain, and hence final weight. Implications Management of kafirin content should be considered to avoid adverse performance effects in pigs fed sorghum.
Funder
Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias
Subject
Animal Science and Zoology,Food Science
Reference39 articles.
1. Adeola O (2001) Digestion and balance techniques in pigs. In ‘Swine nutrition’. (Eds AJ Lewis, LL Southern) pp. 903–916. (CRC Press: Boca Raton, FL, USA)
2. AOAC (2000) ‘Official methods of analysis.’ (Association of Official Analytical Chemists: Arlington, VA, USA)
3. Black JL (2016) Cereal grains as animal feed. In ‘Encyclopedia of food grains. Vol. 3’. (Eds C Wrigley, H Corke, K Seetharaman, J Faubion) pp. 215–222. (Academic Press: Oxford, UK)
4. Castration-induced changes in microRNA expression profiles in subcutaneous adipose tissue of male pigs.;Journal of Applied Genetics,2014
5. CIOMS (2012) International guiding principles for biomedical research involving animals. In ‘The development of science-based guidelines for laboratory animal care’. NCBI Bookshelf. (CIOMS: Geneva, Switzerland)
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献