The Potential of Rice Straw For Ruminant Production in The Tropics-Effect of Variety, Urea Treatment and Supplementation on Compensatory Growth of Fat-Tail Sheep After a Period of Feed-Qaulity Restriction



S. Chuzaemi(1*), J. van Bruchem(2), A. Hidayati(3), Soeharinoto Soeharinoto(4), S. Prawiroknsumo(5)

(1) Animal Husbandry Faculty, Brawijaya University, Jalan Mayjen Haryono 161, Malang 65113. Indonesia
(2) Wageningen Institute of Animal Science (WIAS), Dept. of Anim. Husbandry, Section Anim Prod. Systems, and Dept. of Human and Anim. Physiology, Agric. Univ. Wageningen, Netherlands
(3) Anim. Husbandry Fac., Mummadiyah Univ., Malang, .
(4) Animal Husbandry Faculty, Brawijaya University, Jalan Mayjen Haryono 161, Malang 65113. Indonesia
(5) Animai Husbamlry Facility, GMU, Yogyakarta .
(*) Corresponding Author

Abstract


This research programme was carried out with the obyective to investigate the
potential of delayed compensatory growth after a period of feed quality restriction. Sixty fat-tail sheep of 6-8 months of age and ~20 kg livc weight at the onset of the experiment, were fed diets based on two varieties of rice straw (L, IR 64; H, Knieng Aceh), with (TS) or without (US) urea-ammoniation. Straw was offered at a level of excess of ~1.2. The experiment covered two periods (I, ll) of 120 and 152’ days, respectively. In period I, across varieties (L, H) and treatments (US, TS), the sheep were given various levels of commercial concentrates (~20 % crude protein) 0, 5, 10, 20 and 35 g.kg'0'75.d‘l, respectively. Averaged over level of concentrates (0-35 g.kg' °~75.d'l, straw organic matter (OM) intake (OMIS) and daily gain (DWG) were 37.2, 0.5 (L-US), 44.5, 2.5 (L-TS), 42.2, 1.7 (H-US) and 39.0, 3.2
(H-TS) g.kg'0~75.d'l (SEM 4.5, 0.s3). Averaged over varieties and treatments, OM15 and DWG amounted 43.6, -1.6 (0), 45.3, 0.5 (5), 42.0, 1.6 (10), 37.3, 3.1 (20), 35.4, 6.3 (35) g.kg'U-75.d'l (SEM 5.0, 0,93). With respect to OMI and DWG,
urea treated straws showed a positive associative effect to supplementation at levels 5 and 10 g.kg 0-75.d'1. ht period II, all sheep were given 35 g.kg‘°-75.d'l concentrates. Averaged over level of concentrates in period II straw OMI, and DWG
were 32.4, 5.4 (L-US), 37.1, 5.4 (L-TS), 31.9, 5.0 (H-US) and 32.2, 5.1 (H-TS) g.kg’0-75.d'l (SEM 4.5, 0,81). Averaged over varieties and treatments, straw OMIS and DWG were 36.2, 6.8 (0), 36.7, 5.7 (5), 34.0, 5.0 (10), 29.3, 4.5 (20), 30.3, 4.1 (35) g.kg‘0-75.d'1 (SEM 5.0, 0.91). During this period, particularly sheep in groups 0, 5 and 10 showed a compensatory cfiect with respect to straw OM15 and DWG. Compensatory growth was inversely related to the plane of nutrition in period l, in part brought about by a more effccicnt conversion of digestible organic
matter into gain. This was presumably attributable to a delayed deposition of protein. At the end of the experiment, averaged over level of concentrates live weights were 31.4 (L-US), 34.0 (L-TS), 32.0 (H-US) and 34.3 (l-I-TS) kg (SEM
1.8). Average over varieties and treatments, live weights amounted to 30.8 (0), 31.6 (5), 31.8 (10), 33.2 (20) and 37.1 (35) kg (SEM 2.0).


Keywords


Feed Quality Restriction, Compensatory Growth, Voluntary Feed Intake, Rice Straw Variety, Urea Treatment, Supplement

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