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Effect of concentrate supplementation levels on growth and slaughter characteristics of SEA and SEA × Norwegian goats under on-farm conditions

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Abstract

A 2 × 3 factorial experiment was carried out to evaluate the effect of goat genotypes and different concentrate levels on growth and slaughter characteristics of Small East African × Norwegian crossbred (SEA × N) and Small East African (SEA) goats. The three concentrate levels were T0 (no access to concentrate), T66 (66 % access to ad libitum concentrate allowance) and T100 (100 % access to ad libitum concentrate allowance). Twenty-four castrated goats of each genotype (18 months old with an average weight of 16.7 ± 0.54 kg) were randomly allotted into T0, T66 and T100 treatments. Daily feed intake and fortnight body weight measurements were recorded for the whole 84-day experimental period, after which the animals were slaughtered. Feed intake of T100 animals was 536 g/day, which was 183 g/day higher than that of the T66 group. Supplemented goats (T66 and T100) had significantly (P < 0.05) higher daily gain and body condition score, and better feed conversion efficiency and dressing percentage than T0 goats. The SEA goats had higher (P < 0.05) hot carcass weight (8.2 vs. 7.9 kg) and showed better (P < 0.05) dressing percentage than SEA × N animals. Among supplemented goats, the cost of a 1-kg gain under T66 was Tshs 213/= cheaper than T100 (US$1 ≈ Tshs 1,500). It is concluded that goats should be grazed and supplemented with 353 g concentrate/day for satisfactory fattening performance and higher economic return on investment.

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Acknowledgments

The authors wish to thank SUA-PANTIL project 020 and the German Academic Exchange Service (DAAD) for the financial and technical support of this project.

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Authors and Affiliations

  1. Department of Animal Science and Production, Sokoine University of Agriculture, P.O. Box 3004, Morogoro, Tanzania

    William A. Hozza, George C. Kifaro & Daniel E. Mushi

  2. Institute of Rural Development Planning, P.O. Box 138, Dodoma, Tanzania

    John G. Safari

Authors
  1. William A. Hozza
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  2. George C. Kifaro
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  3. John G. Safari
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  4. Daniel E. Mushi
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Correspondence to William A. Hozza.

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Hozza, W.A., Kifaro, G.C., Safari, J.G. et al. Effect of concentrate supplementation levels on growth and slaughter characteristics of SEA and SEA × Norwegian goats under on-farm conditions. Trop Anim Health Prod 45, 1789–1794 (2013). https://doi.org/10.1007/s11250-013-0436-x

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  • DOI: https://doi.org/10.1007/s11250-013-0436-x

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