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Image 75 of Progress report (Kentucky Agricultural Experiment Station) n.176

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-73- 100, and 120 lb). These lambs were fed a high concentrate pelleted ration in pens of three lambs each. They were weighed weekly until they reached slaughter weight. They were then slaughtered and carcass measurements were taken. Average daily gain and feed consumption were measured for every 9. 1 kg increment from 18. 1 kg to slaughter. _' Results and Discussion Average daily gains reached a maximum of .355 kg from 36. 2 to 45. 3 kg body- weight, and declined to 0. 281 kg from 45. 3 to 54. 4 kg bodyweight (Table 1). Feed efficiency decreased from 3. 66 kg feed/kg gain for the 18. 1 to 27. 2 kg period, to 8. 08 for the 45. 3 to 54. 4 kg growth period. Total gains from 18. 1 to 54. 4 kg required 5. 50 kg feed/kg gain. Loin-eye area and fat thickness measurements were, respectively: 14. 2 sq . cm, 0.51 cm (36.2 kg lambs); 15. 8 sq cm, 0.74 cm (45.3 kg lambs), and 16.0 sq cm, 1. 19 cm (54. 4 kg lambs). These data suggest that most of the muscle development ` occurred in these lambs prior to 45. 3 kg bodyweight. Performance of lambs from 18. 1 to 54. 4 kg was negatively correlated with percent fat in the rack and backfat thickness ( 0. 59** and - 0. 51**, respectively). Correlations between loin-eye area and lamb performance were low and non-significant. Since gains for lambs over 45. 3 kg (100 lb) were much less efficient than earlier gains ` and appeared to consist primarily of fat, feeding lambs of this type to heavier weights does not seem advisable. Table 1. Average Daily Gain and Feed Consumption at ( Different Weights Average Weight Daily Feed/ gain Gain kg kg kg kg Birth 18.1 0. 294 - _ 18.1 -27.2 .299 3.66 . 27.2 -36.2 .344 4.82 36.2 -45.3 .355 5.64 o 45.3 -54.4 .281 8.08 V _ Table 2. Correlation between Performance and Carcass Measurements Loin-eye Percent Fat Backfat Area in Rack Thickness ADG, 18.1 -36.2kg 0.28 -0.01 -0.002 _ Slaughter wt. , 36. 2 kg - 0.20 0.08 0.01 V ADG, 18.1 -45.3kg 0.27 -0.12 - 0.03 Slaughter wt., 45.3 kg - 0.40* 0.30 0.05 ADG, 18.1 - 54.4 kg 0.05 0.49** 0.50** Slaughter wt. , 54. 4 kg 0.14 0.59** 0.51** *P ( 0.05 **P < 0.01

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