Muhammad I. MUSTAFA, John P. CHADWICK, Pervez AKHTAR, Safdar ALI, Muhammad LATEEF, Javed I. SULTAN

The Effect of Concentrate- and Silage-Based Finishing Diets on the Growth Performance and Carcass Characteristics of Suffolk Cross and Scottish Blackface Lambs

In the present study 48 Suffolk x Mule (S x M) and 48 Scottish Blackface (SBF) wether lambs were used in a 2 breeds x 2 diets x 4 replications factorial experiment with 6 lambs per pen. Lambs were offered either a concentrate (CONC) finishing diet (DM: 876 g kg-1, estimated ME: 10.9 MJ kg-1 of DM, estimated DUP: 32.4 g kg{-1} of DM) ad libitum, together with 100 g hay head-1 day-1, or silage (SIL) offered ad libitum (D value: 67.2), together with up to 450 g head-1day-1of a concentrate supplement (DM: 888 g kg-1, estimated ME: 10.9 MJ kg-1 of DM, estimated DUP: 63.9 g kg-1 of DM). Lambs were slaughtered at estimated MLC fat class 2 to 3L. Both breed and diet had a significant effect on daily live weight gain (DLWG) (S x M: 282 vs. SBF: 210 g; CONC: 383 vs. SIL: 109 g) and the food conversion ratio (FCR) was significantly affected by diet (CONC: 5.3 vs. SIL: 7.7). Breed x diet interactions were significant for both DLWG and FCR. Conformation score was better in the S x M lambs than in the SBF lambs (3.2 vs. 2.6; scale E = 5, P = 1), whereas diet influenced the estimated subcutaneous fat proportion (CONC: 121.5 g kg-1vs. SIL: 113.2 g kg-1).

Anahtar Kelimeler:

Lamb, breed, diet, growth, carcass

The Effect of Concentrate- and Silage-Based Finishing Diets on the Growth Performance and Carcass Characteristics of Suffolk Cross and Scottish Blackface Lambs

Keywords:

Lamb, breed, diet, growth, carcass,

PDF

___

Woolliams, J.A., Wiener, G.: A note on the growth and food consumption of crossbred lambs of five sire breeds. Anim. Prod., 1983; 37: 137-140.
Damry, Nolan, J.V., Bell, R.E., Thompson, E.S.: Duckweed as a protein source for fine wool Merino sheep: its edibility and effects on wool yield and characteristics. Asian Aust. J. Anim. Sci., 2001; 14: 507-514.
Fayyaz, A., Jabbar, M.A., Naz, N.A.: Optimum level of concentrates for gaining rapid growth in Lohi lambs. In: 23rd Annual Report. Livestock Production Research Institute, Bhadarnagar, Okara, Pakistan. 2002; pp: 45-46.
Field, R.A., Maiorano, G., McCormick, R.J., Riley, M.L., Russell, W.C., Williams, F.L., Crouse, J.D.: Effect of plane of nutrition and age on carcass maturity of sheep. J. Anim. Sci., 1990; 68: 1616- 1623.
Mazumder, M.A.R., Hossain, M.M., Akhtar, S.: Effect of levels of concentrate supplement on live weight gain and carcass characteristics in sheep on restricted grazing. Asian Aust. J. Anim. Sci., 1998; 11: 17-21.
Petit, H.V., Castonguay, F.: Growth and carcass quality of prolific crossbred lambs fed silage with fish meal or different amounts of concentrate. J. Anim. Sci., 1994; 72: 1849-1856.
McClure, K.E., VanKeuren, R.W., Althose, P.G.: Effect of grazed forages and concentrate in drylot on lamb carcass characteristics. J. Anim. Sci., 1985; 61 (Suppl. 1): 341 (abstract).
Wolf, B.T., Smith, C.: Selection for carcass quality. In: Haresign, W. ED, Sheep Production. Butterworths, London. 1983, pp. 493- 514.
Croston, D., Pollott, G.: Planned Sheep Production. Collins, London. 1985.
McClelland, T.H., Bonaiti, B., Taylor, St. C.S.: Breed differences in body composition of equally mature sheep. Anim. Prod., 1976; 23: 281-293
Kempster, A.J., Croston, D., Guy, D.R., Jones, D.W.: Growth and carcass characteristics of crossbred lambs by ten sire breeds, compared at the same estimated carcass subcutaneous fat proportion. Anim. Prod., 1987; 44: 83-98.
Murphy, T.A., Loerch, S.C., McClure, K.E., Solomon, M.B.: Effects of grain or pasture finishing systems on carcass composition and tissue accretion rates of lambs. J. Anim. Sci., 1994; 72: 3138-3144.
Notter, D.R., Kelly, R.F., McClaugherty, F.S.: Effects of ewe breed and management system on efficiency of lamb production: II. Lamb growth, survival and carcass characteristics. J. Anim. Sci., 1991; 69: 22-33.
Saatci, M., Yildiz, S., Kaya, I.: New rearing systems for Tuj (Tushin) lambs. Small Rumin. Res., 2003; 50: 23-27.
Anderson, J.M.L.: An evaluation of entire males for lamb production. PhD Dissertation. University of Newcastle upon Tyne U.K. 1996.
Povey, G.M.: Responses of store lambs to protein and energy supplementation of grass silage as a finishing ration. PhD Thesis. University of Newcastle upon Tyne, UK. 1990.
Tariq, M.: Influence of system of production on growth performance and carcass composition of Lohi lambs. MSc Dissertation. University of Agriculture, Faisalabad, Pakistan. 2006.
Binnie, D.B., Clarke, J.N., Clayton, J.B., Mowat, C.M., Purchas, R.W.:. Effect of genotype and nutrition on sheep carcass fat and eye muscle development between weaning and 14 months of age. Proc. New Zealand Soc. Anim. Prod. 1995; 55: 104-107.
Lloyd, W.R., Slyter, A.L., Costello, W.J.: Effect of breed, sex and final weight on feedlot performance, carcass characteristics and meat palatability of lambs. J. Anim. Sci., 1980; 51: 316-320.
Kemp, J.D., Mahyuddin, M., Ely, D.G., Fox, J.D., Moody, W.G.: Effects of feeding systems, slaughter weight and sex on organoleptic properties and fatty acid composition of lamb. J. Anim. Sci., 1980; 51: 321-330.
Crouse, J.D., Busboom, J.R., Field, R.A., Ferrell, C.L.: The effects of breed, diet, sex, location and slaughter weight on lamb growth, carcass composition and meat flavour. J. Anim. Sci., 1981; 53: 376-386.