المقالات العلمية - كلية الزراعة

Permanent URI for this collectionhttps://repository.neelain.edu.sd/handle/123456789/3068

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Start date: 2008Subject: search.filters.subject.Broilers

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    Growth Performance and Carcass Characteristics of Broilers Fed Different Levels of Dietary Lysine
    (2014) Mohamed E. Ahmed; Talha E. Abbas
    The effect of feeding different levels of dietary lysine (100%, 110% and 120% of NRC 1994 recommendations) was evaluated in the current study. These levels were included in broiler starter and finisher diets. A completely randomized experimental design was used. Feed intake and body weight gain in broilers receiving 110% of NRC 1994 lysine, were significantly (P≤0.05) increased versus control. However, feeding 120% lysine significantly (P≤0.05) decreased feed intake. Body weight gain was not different (P≥0.05) among broilers fed control diet and 120% lysine. Feed conversion ratio was not significantly (P≥0.05) different among dietary lysine levels. There was no significant (P≥0.05) effect of dietary lysine levels on dressing percentage, relative weight of gizzard and liver. However, relative weight of abdominal fat decreased significantly in broilers received 110% and 120% of NRC lysine. It was concluded that offering 110% of NRC lysine to broiler chicks enhanced feed intake and body weight gain, but supplying of dietary lysine to broiler chicks above this level might decrease feed intake. Addition of 110% and 120% NRC lysine to broiler diet declines relative weight of abdominal fat.
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    Effect of supplementation of Nigella sativa seeds to the broiler chicks diet on the performance and carcass quality
    (2010) Talha E. E. Abbas; Mohamed E. Ahmed
    Abstract- The research was conducted to examine the effects of supplementation of Nigella sativa seeds to the broiler chicks’ diet on the performance and carcass quality. A total of 96 one – day – old unsexed broiler chicks (Hubbard) were used. The experiment lasted 5 weeks (8 – 42 day). Three experimental diets were supplied ad – libitum. 1% whole crushed Nigella sativa seeds (WCNSS) were added to the first experimental diet. To the second diet 2% Nigella sativa seeds was added. The third one which is the control was free of whole crushed Nigella sativa seeds (WCNSS). Supplementation of ground black seeds to the broilers chicks diet resulted in a significant (P< 0.01) decreased in feed consumption, body weight gain and live body weight. Birds fed on diet supplemented with 1% whole crushed Nigella sativa seeds showed a significant (P< 0.05) reduction in dressing % when compared to those fed on control or 2% supplemented diets. Addition of ground black seeds had no significant effect on feed conversion ratio liver, gizzard, heart and abdominal fat %. It was concluded that addition of 1% or 2% whole crushed Nigella sativa seeds to the broiler chicks diet produces adverse effects on the performance and carcass quality.
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    Effect of Dietary Yeast (Saccharomyces cerevisiae) Supplementation on Performance, Carcass Characteristics and Some Metabolic Responses of Broilers
    (2015) Mohamed E. Ahmed; Talha E. Abbas; Mojahid A. Abdlhag; Dafaalla E. Mukhtar
    Abstract: This study was conducted to evaluate the effect of feeding graded levels of yeast on broiler performance, carcass characteristics and some hematological indices. One day old Hubbard broiler chicks (n=160) were randomly allocated to five dietary treatments. Each treatment consisted of 4 replicates of 8 broilers each. The dietary treatments contained 0% yeast (Saccharomyces cerevisiae) as a negative control diet, 0% yeast + 30 ppm Oxytetracyline as a positive control, 1%, 2% and 3% yeast in the starter and finisher diets. During the experimental periods of 6 weeks, feed intake, body weight gain and feed conversion ratio values were calculated. At the end of the experimental period (6 weeks of age), some biochemical and hematological indices, carcass characteristics traits and internal organs weights were recorded. Growth performance parameters were significantly (P≤0.05) affected by experimental diets. Chicks fed either 0 or 3% yeast recorded the highest (P≤0.05) feed intake, however, the best (P≤0.05) body weight gain was obtained by birds fed 0 or 1% dietary yeast compared to the positive control diet. The highest (P≤0.05) feed conversion ratio was reported for birds fed the positive control diet and 3% dietary yeast compared to the negative control diet. The inclusion of different dietary treatments had no significant (P≥0.05) effects on dressing percentage, hot base and relative weights of heart, gizzard and abdominal fat. Nevertheless, birds fed 3% dietary yeast showed significant (P≤0.05) decrease in the relative weight of the liver compared to the negative control diet. Relative weights of breast and thigh were significantly (P≤0.05) higher in birds fed 1% yeast than those fed 3% yeast. There were linear decreases in serum cholesterol and albumin of broilers fed graded levels of dietary yeast. It is concluded that yeast can be included in broiler diet at 1% without detrimental effects on performance, and could therefore serve as a natural substitute for antibiotics.