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Abstract
ABSTRACT
Alsheimaa Mohamed Nazmy Abd-ELhalim: Improving Productive
Performance of Rabbits Fed Different Levels of Some Amino Acids
Under Summer Conditions,Unpublished M.Sc. Thesis, Department
of Poultry production, Faculty of Agriculture, Ain Shams
University, 2015.
The main objective of the study was to elucidate the effects of high
ambient temperature on productive performance and physiological response
of NZW growing rabbits supplemented or non- supplemented with different
levels of methionine, lysine or their combination. A total of 150 unsexed
NZW growing rabbits aged about 28 days, 650 g with an average initial
weight were divided into 10 treatment groups, each treatment group divided
into 3 rep. of 5 rabbits each. The treatment groups were assigned as
follow: T1: un-supplemented group, rabbits were fed on a basal diet. Groups
from T2:T10 were fed on a basal diet plus meth., lys. or their combination as
follow: T2: 25% meth., T3: 50% meth., T4: 100% meth., T5: 25% lys., T6:
50% lys., T7: 100% lys., T8: 25% meth. + 25% lys., T9: 50% meth. + 50%
lys. and T10: 100% meth. +100% lys. All rabbits were kept under the
ambient temperature during the period from June to July and the average
ambient temperatures recorded during the experimental period was 33ºC ±
2ºC and 23 ºC ± 2ºC for maximum and minimum indoor temperature, resp.
At 12 week of age (WOA) the temperature was increased to 36ºC±1ºC / 6
hrs daily for 3 consecutive days at the end of the experimental period. The
results showed that live body weight, body weight gain and feed conversion
ratio were significantly improved under high temperature for rabbits
received diets supplemented with methionine, lysine or their combinations
compared with rabbits fed basal diet (un- supplemented amino acids). The
levels of glucose, cholesterol, TP and A/G ratio were increased significantly
Alsheimaa M.N. Abd-Elhalim, M.Sc., 2015
in supplemented groups compared with un- supplemented group while
triglycerides, globulin, ALT and AST were decreased. Highly significant
increase in both RT and RR were observed in un-supplemented group than
supplemented group. The hematological parameters Hb, RBCs count and
HT% values were also. increased with increase the levels of meth. or lys. or
their combinations. The addition of essential amino acids was benefit and
improves the immune system function.