Biomedical subjects

M M Shanawany

Publications and source records attributed to M M Shanawany.

8 recordsLinked to original sources

PubMed1993

Influence of sequence length on the response to ahemeral lighting late in lay.

1. An experiment is described in which 96 individually-caged SCWL hens in two rooms were used to investigate the response to changing to a 28-h cycle using a reverse treatment design. 2. The application of the 28-h cycle did not affect mean rate of lay but increased mean egg weight and egg output. 3. Grouping the birds according to their preliminary sequence length yielded an interesting outcome. In both rooms, birds with short sequences (< or = 6 eggs) produced significantly more eggs under the 28-h cycle, while those with long sequences (> 6 eggs) produced marginally fewer eggs. The same trend was also evident with egg output. 4. Changing from 24-h to 28-h increased yolk and albumen weights as well as shell quality. However, relative to egg weight, no measurable effect was detected due to light cycle, age or sequence length on yolk and albumen weights. 5. The paper provides new evidence suggesting that long ahemeral cycles could be used to improve egg production as well as shell thickness in flocks with modest rates of lay.

Animals↗

PubMed1993

Genotypic differences in speed and magnitude of response to ahemeral lighting.

1. The paper compares between three genetically different lines in their egg weight and shell thickness response to a 28-h cycle. 2. The response in shell thickness to ahemeral lighting was more rapid (2.2 d) than for egg weight (4.2 d). 3. Differences between genotypes were evident in both the speed and magnitude of response. 4. Overall, egg weight and shell thickness on the 28-h cycle were 7% and 8% greater than on 24 h. 5. The allometric increase indicates that the increase in shell weight was on average 14% more than the increase in egg weight.

Animals↗

PubMed1992

Influence of age and body mass on the heating effect of microwave radiation in broilers.

1. A total of 648 broilers was used in a factorial combination of 3 ages x 3 body masses x 4 microwave treatments to examine the possible interaction between bird age and body mass on the heating effect of microwaves. 2. As age or body mass increased, the increase in body temperature following exposure to microwaves decreased curvilinearly. 3. A significant interaction was evident between age and body mass. For the same body mass, microwave radiation exerted a greater heating influence at the younger age. 4. A model for the heating effect of microwaves is presented which takes into account the influence of both bird age and irradiated body mass.

Aging↗

PubMed1988

Effect of non-ionising radiation on body weight and growth of the gastro-intestinal tract in broilers.

1. The effect of time dose microwave radiation (0, 10, 20, 30, 40 or 50 s at a wave frequency of 2,450 MHz and a density of 406 mW/sq cm) on body weight and growth of the gastro-intestinal tract was studied in commercial broilers. 2. In general, the observed effects increased in a linear fashion with the microwave dose. 3. Birds exposed to 40 or 50 s were significantly heavier at 8 weeks than non-treated birds. 4. The microwave treatments caused an increase in weight and a decrease in length of the whole gastro-intestinal tract. 5. The regions of the gastro-intestinal tract were affected differently: the largest effects being recorded in the duodenum, small intestine and rectum.

Animals↗

PubMed1988

Broiler performance under high stocking densities.

1. In two consecutive experiments a total of 4,780 broilers were reared at high stocking densities. 2. In experiment 1, the birds were housed at 10, 20, 30, 40 or 50/m2 till 6 weeks. In experiment 2 densities of 20, 40 and 50/m2 were compared; the two higher densities were reduced to 30/m2 at either 3 or 5 weeks of age. 3. In the first experiment 6-week body weight was a curvilinear function of stocking density. Average food intake over the whole experimental period declined linearly with densities above 20/m2. 4. A slight but significant improvement in the efficiency of food utilisation was recorded from birds at high densities in the first experiment only. 5. Reducing the stocking density from 40 or 50/m2 to 30/m2 at 3 weeks increased food consumption and body weight gain and led to a recovery in their body weight by 6 weeks. 6. No significant differences were observed in mortality as a result of high stocking densities in either experiment. 7. Profit margin per m2 increased almost linearly in experiment 1, by about 65 p for every bird/m2 increase in stocking density. 8. The implications for poultry welfare are briefly discussed.

Animals↗

PubMed1987

The effect of carbimazole on growth and sexual maturity in the pullet.

Carbimazole (100 mg/kg diet) was fed to pullets from 8 to 12 or from 12 to 16 weeks of age. Pullets fed carbimazole from 8 to 12 weeks of age matured about 12 d earlier and produced more eggs between 17 and 22 weeks of age. Their body weights and feed intake were significantly lower than those of normal birds. Feeding carbimazole from 12 to 16 weeks of age had no significant effect on the birds except during the course of treatment where their feed consumption was less than that of the controls.

Animals↗

PubMed1984

Inter-relationship between egg weight, parental age and embryonic development.

A clear positive correlation was evident between egg weight at setting and embryo weight at 18 d of incubation for eggs laid at or after 32 weeks of age. The weight of embryos from the same size eggs were found to depend upon a curvilinear function of the age of parent flock, with the largest increase in embryo weight occurring between 28 and 32 weeks of age. Hatching weight was highly correlated with egg size at setting. Flock age had no effect on hatching weight from a particular sized egg. Within any of the five ages studied, chicks from smaller eggs tended to hatch slightly (but not significantly) earlier than those from larger eggs.

Age Factors↗

PubMed1979

Effect of protamine zinc insulin on feed intake and weight gain in broiler chicks.

Ten-day old Robro broiler chicks were used to test the effect of daily subcutaneous injections of two insulin levels (5- and 10-IU . kg-1 BW) administered for two different periods (5 and 21 days). Birds which received either 5- or 19-IU insulin significantly increased their feed intake over those of the controls (P less than 0.05). However, the lower insulin dose was found to be more effective in increasing both the feed consumption and weight gain of the birds, especially if administered for a long period. Between the injection periods, the high insulin dose seemed to have a greater carry-over effect. On the other hand, the administration of 5- or 10-IU insulin for either 5 or 21 days had no effect on efficiency.

Animals↗