The effect of concentrate- and silage-based finishing diets on the growth performance and carcass characteristics of Suffolk Cross and Scottish Blackface lambs
2008
Mustafa, M.I., University of Newcastle, School of Agriculture, Food and Rural Development, Newcastle (UK) | Chadwick, J.P., University of Newcastle, School of Agriculture, Food and Rural Development, Newcastle (UK) | Akhtar, P., University of Agriculture, Faculty of Veterinary Science, Faisalabad (Pakistan). Div. of Animal Husbandry | Ali, S., University of Agriculture, Faculty of Veterinary Science, Faisalabad (Pakistan). Div. of Animal Husbandry | Lateef, M., University of Agriculture, Faculty of Veterinary Science, Faisalabad (Pakistan). Div. of Animal Husbandry | Sultan, J.I., University of Agriculture, Faculty of Veterinary Science, Faisalabad (Pakistan). Div. of Animal Husbandry
In the present study 48 Suffolk × Mule (S × M) and 48 Scottish Blackface (SBF) wether lambs were used in a 2 breeds × 2 diets × 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-1 day-1 of 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 × 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 × diet interactions were significant for both DLWG and FCR. Conformation score was better in the S × 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-1 vs. SIL: 113.2 g kg-1).
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