Abstract
Feed cost has a significant effect on the economic efficiency of feedlot lambs; therefore, the use of low-cost non-conventional feedstuffs, such as olive pulp (OP), has the potential to decrease the production costs. Because optimum inclusion of OP-treated silages has not been determined in feedlot lambs, an experiment was conducted to determine the effect of inclusion of OP ensiled with additives in the diet on the feedlot performance and carcass attributes of feedlot lambs. Ram lambs of Mehraban and Ghezel breeds (n = 50 lambs per breed) were randomly allotted to 10 groups and fed with one of the nine diets containing OP silage or a control diet. Silage treatments were: (1) OP silage without additives (OPS), (2) OP ensiled with 8 % beet molasses and 0.4 % formic acid (OP-MF), and (3) OP ensiled with 8 % beet molasses, 0.4 % formic acid and 0.5 % urea (OP-MFU). The control diet contained 50 % alfalfa hay and 50 % barley grain. Three levels from each silage were chosen to replace the barley grain (10, 20, or 30 % dry matter basis). The lambs were slaughtered after 92 days, and the average daily gain (ADG), feed conversion ratio (FCR), and carcass characteristics were determined. Feeding OPS to fat-tailed lambs, at an inclusion level of 30 %, decreased the carcass dressing percentage, mainly as a result of decreased brisket percentage, but the ADG and FCR values were not adversely affected. Ghezel lambs had higher ADG than Mehraban lambs, but the visceral fat weight percentage, flap weight percentage, and back fat depth were higher in Mehraban. The crude protein content in the longissimus dorsi (LD) muscle was higher in Ghezel, but the dry matter percentage was higher in Mehraban (P < 0.05). Other attributes were not significantly affected by breed (P > 0.05). Most carcass characteristics, including major cuts, were not affected by OPS feeding; therefore, feeding OPS (up to 30 %) can be economical for feedlot lambs. Most carcass characteristics, including major cuts, were not affected by OPS levels used in this experiment; therefore, inclusion of OPS (up to 30 %) in the diet may reduce the cost of raising feedlot lambs. This also could help alleviate the problem of storage of OP in oil factories.
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References
Al-Masri, M. R., 2005. Nutritive value of some agricultural wastes as affected by relatively low gamma irradiation levels and chemical treatments. Bioresource Technology, 96, 1737–1741.
Al Jassim, R. A. M., Awadeh, F. T. and Abodabos, A., 1997. Supplementary feeding value of urea-treated olive cake when fed to growing Awassi lambs. Animal Feed Science and Technology, 64, 287–292.
AOAC, 1998. Official Methods of Analysis of the Association of Official Analytical Chemists. 16th ed. Association of Official Analytical Chemists, Washington DC.
Awawdeh, M. S., 2011. Alternative feedstuffs and their effects on performance of Awassi sheep: a review. Tropical Animal Health and Production, 43, 1297–1309.
Farid, A., 1989. Direct, maternal and heterosis effects for slaughter and carcass characteristics in three breeds of fat tailed sheep. Livestock Production Science, 23, 137–162.
Giozelgiannis, A., Tsiklidi, K. and Katanos, I., 1978. The olive meal in the feeding of fattening lambs. Agricultural Research, 2, 223–233.
Makkar, H. P. S., 2003. Effects and fate of tannins in ruminant animals, adaptation to tannins, and strategies to overcome detrimental effects of feeding tannin-rich feeds. Small Ruminant Research, 49, 241–256.
Martin Garcia, A. I., Moumen, A., Yanez Ruiz, D. R. and Molina Alcaide, E., 2003. Chemical composition and nutrients availability for goats and sheep of two-stage olive cake and olive leaves. Animal Feed Science and Technology, 107, 61–74.
Mioc , B., Pavic, V., Vnucec, I., Prpic, Z., Kostelic, A. and Susic, V., 2007. Effect of olive cake on daily gain, carcass characteristics and chemical composition of lamb meat. Czech Journal of Animal Science, 52, 31–36.
Molina, E. and Aguilera, J. F., 1988. Nutritive value of a soda-treated olive cake. Digestibility of cell wall components. Annales de Zootechnie, 37, 63–72.
Molina-Alcaide, E. and Yanez-Ruiz, D. R., 2008. Potential use of olive by-products in ruminant feeding: A review. Animal Feed Science and Technology, 147, 247–264.
Nefzaoui, A. and Vanbelle, M., 1986. Effects of feeding alkali-treated olive cake on intake, digestibility and rumen liquor parameters. Animal Feed Science and Technology, 14, 139–149.
Owaimer, A. N., Kraidees, M. S., Al-Saiady, M., Zahran, S. and Abouheif, M. A., 2004. Effect of feeding olive cake in complete diet on performance and nutrient utilization of lambs. Asian-Australasian Journal of Animal Sciences, 17, 491–496.
Rowghani, E., Zamiri, M. J. and Seradj, A. R., 2008. The chemical composition, rumen degradability, in vitro gas production, energy content and digestibility of olive cake ensiled with additives. Iranian Journal of Veterinary Research, 9, 213–221.
Sansoucy, R., 1985. Olive By-Products for Animal Feed. FAO Animal Production and Health, Rome.
SAS, 2002. User’s Guide. Statistical Analysis Systems Institute Inc., Cary, NC, USA.
Theriez, M. and Boule, G., 1970. Feeding value of olive cakes. Annales de Zootechnie, 19, 143–157.
Weinberg, Z. G., Chen, Y. and Weinberg, P., 2008. Ensiling olive cake with and without molasses for ruminant feeding. Bioresource Technology, 99, 1526–1529.
Winters, A.L., Fychan, R., Jones, R., 2001. Effect of formic acid and a bacterial inoculant on the amino acid composition of grass silage and on animal performance. Grass and Forage Science, 56, 181–192.
Zamiri, M. J. and Izadifard, J., 1995. Effects of metaproterenol, a beta-adrenergic agonist, on feedlot performance and body composition of two fat-tailed breeds of sheep. Small Ruminant Research, 18, 263–271.
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The authors would like to thank the director and the staff of the Animal Research Station, and the Research Assistants of the Department of Animal Science for their cooperation during the conduct of the experiment.
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Ebrahim Rowghani has already retired.
An erratum to this article is available at http://dx.doi.org/10.1007/s11250-014-0555-z.
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Taheri, M.R., Zamiri, M.J., Rowghani, E. et al. Effect of feeding olive-pulp ensiled with additives on feedlot performance and carcass attributes of fat-tailed lambs. Trop Anim Health Prod 45, 345–350 (2012). https://doi.org/10.1007/s11250-012-0224-z
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DOI: https://doi.org/10.1007/s11250-012-0224-z