Thesis Abstract

Two hundred and forty 14-day old broiler birds were used in a study conducted to investigate the physiological response of boiler birds to oral supplementation with aloe vera gel and neem leaf extracts. In experiment one, one hundred and twenty 14- day old broilers were used to assess the physiological response of the broiler birds to oral supplementation with alovera gel extract, while in experiment two, one hundred and twenty 14- day old broilers were used to assess the physiological response of the broiler birds to oral supplementation with neem leaf extract. The birds of both sexes were randomly allotted into five treatment groups of 24 birds each in a completely randomized design (CRD) in both experiments. Treatments 1, 2, 3, 4, and 5 received ordinary water, Vitaltye, 10, 20, and 30% of each of the two extracts, respectively. Results obtained in experiment one showed that there were significant (p<0.05) differences in final body weight, feed conversion ratio, average cost/kg gain and mortality rate. Birds on T4(20%AVGE) had the lowest feed conversion ratio(3.09) and lower average cost of feed per kg gain(N308.67) than others with feed conversion ratio [ T1(3.36), T2(3.46),T3(3.21) and T5(3.18), and average cost of feed per kg gain [T1((N336.33), T2(N345.67), T5(N317.66), respectively. There were significant (p<0.05)differences among treatments in packed cell volume, red blood cells, hetrophil, lymphocyte, moncyte, eosnoohil, and basophil. There were also   significant (p<0.05) differences among treatments in crude protein, ether extract and nitrogen free ether retained; significant differences existed among treatments in total protein, albumin globulin, glucose, creatine, cholesterol and calcium. Live body weight, dressed weight (%LW), head, gizzard, empty gizzard, shank, heart, liver, kidney, abdominal fat, lungs, and large intestine were significantly affected by treatments. However, there were no significant (p<0.05) differences among treatments in average daily weight gain, average daily feed intake, daily water intake, protein efficiency ratio, white blood cell, dry matter retrained, dressed weight(kg), and small intestines. Birds that received neem leaf extract (T4 and T5) showed progressive increase in final body weight (3.42kg and 3.70kg, respectively) compared to the control (3.14kg) and T2 [(vitalyte) (3.39kg)]. Birds on T5(30%NLE) had the lowest feed conversion ratio(2.85) and lower average cost of feed per kg gain(N284.67) than others which had feed conversion ratio of 3.48 (T1), 3.21 (T2), 3.29 (T3) and 3.15 (T4), and average cost of feed per kg gain as followsT1(N347.67), T2(321.00), and T4(N315.33). There were significant (p<0.05) differences among treatments in packed cell volume, red blood cells, hetrophil, lymphocyte, moncyte, eosnoohil, and basophil. Significant differences (p<0.05) also existed between treatments in the apparent retentions of crude protein, ether extract and nitrogen free ether, and in total protein, albumin, globulin, glucose, cholesterol and calcium. There were also significant (p<0.05)differences among treatments in live weight, dressed weight(%LW), head, gizzard, empty gizzard, shank, heart, liver, kidney, abdominal fat, lungs, large intestine and small intestine. However, there were no significant (p<0.05) differences among treatments in average daily feed intake, total water intake, dry matter retained, and serum creatine. Results showed that the levels of aloe vera gel and neem leaf extracts used in the present study enhanced the growth performance of broiler birds, especially at 20% and 30% inclusions.

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