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|Advisor:||Kumar, V. Ramesh Saravana|
|Title:||Effect of Concentrate and Urea Molasses Mineral Block (UMMB) Supplimentation on the Performance of Mecheri Lambs for Mutton Production|
|Publisher:||Tamil Nadu Veterinary and Animal Sciences University|
|Abstract:||A study was undertaken to assess the performance of Mecheri ram lambs under concentrate and urea molasses mineral block (UMMB) supplementation. Two growth trials were conducted with Mecheri weaner ram lambs. In the first trial, performance of main season lambs born from December to February (40 animals in five groups of eight lambs each) were reared under two systems of rearing viz., stall feeding and grazing for a period of 150 days. Highest body weight (P < 0.01) was observed in grazing with concentrate supplementation (T2) group (24.46 ± 0. 89 kg) at the end of 150 days growth period, followed by grazing with UMMB supplemented (T3) group (21.77 ± 1.16 kg), stall fed group under concentrate (20.70 ± 0.78 kg) supplementation (T4) and stall fed group under UMMB (18.85 ± 0.38 kg) supplementation (T5). Unsupplemented grazing group (T1) had the lowest body weight (18.65 ± 0.89 kg). In the second trial, performance of off season lambs born from June to August (24 lambs in three groups of eight lambs each) was studied. Body weight was significantly (P < 0.01) higher (23.48 ± 0.87 kg) in the concentrate supplemented group (T2), followed by UMMB supplemented (20.10 ± 0.78 kg) group (T3) and lowest (16.80 ± 0.98 kg) in unsupplemented control group (T1). Off season animals required longer duration (180 days) to attain market weight. Comparison of body weight of lambs between main and off seasons indicated better body weights for main season lambs. The difference was significant (P < 0.05) for the grazing group (T1) and highly significant (P < 0.01) for the T2 and T3 groups, because of the availability of quality fodder to the main season lambs. Among the stall fed groups (T4 and T5), cumulative DMI (P < 0.01) and cumulative body weight gain (P < 0.01) were significantly higher in concentrate supplemented group (86.71 ± 0.25 kg and 10.88 ± 0.54 kg) compared to UMMB supplemented group (74.91 ± 0.13 kg and 9.06 ± 0.56 kg). At the end of the experiment, cumulative FCR was not significantly different and cumulative per cent feed efficiency was significantly (P < 0.05) higher (12.55 ± 0.64 per cent) in T4 group. Blood biochemical parameters revealed that total protein increased in supplemented groups. The main season lambs exhibited no significant difference in serum albumin values between the groups at the end of growing period. But, in off season animals, serum albumin levels increased significantly (P < 0.05) as a result of supplementation. Serum calcium values were higher (P < 0.05) in supplemented groups and among them, UMMB supplementation groups had higher values than concentrate supplementation groups. Concentrate supplemented groups had significantly (P < 0.05) higher serum phosphorus both under grazing and stall feeding followed by UMMB supplemented groups. Supplemented grazing groups (T2 and T3) had higher (P < 0.05) serum cholesterol than unsupplemented grazing group (T1) and stall fed groups. UMMB supplemented groups (T3 and T5) had significantly (P < 0.01) higher BUN values than the other groups. There was no difference between the rearing systems. Slaughter studies revealed that T2 group was better in most of the carcass characteristics, carcass scores and sensory evaluation of meat followed by T3 group. Stall fed animals had lower values compared to supplemented grazing groups (T2 and T3). In off season lambs also, the same trend prevailed among the three grazing groups. Prevalence of endo-parasitism was more in rainy season compared to summer as indicated by the Eggs Per Gram and Oocysts Per Gram counts. Stall fed animals had lower faecal egg counts than grazing groups and OPG count was higher under stall feeding. EPG and OPG counts were little affected by supplementation. Grazing with supplementation of main season Mecheri lambs was more profitable for mutton production than stall feeding. Concentrate fed groups fetched higher net return than UMMB supplementation. However, UMMB supplementation helped to increase the net income compared to the lambs without supplementation. Similar trend was observed in off season lambs. Net returns of off season lambs were lower than that of main season lambs indicating that the need for supplementation for off season lambs.|
|Appears in Collections:||Theses & Dissertations|
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