MODULATORY ROLE OF ANTIOXIDANT VITAMINS ON RECTAL TEMPERATURE FLUCTUATIONS IN PULLETS DURING THE HOT – DRY SEASON

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dc.contributor.authorSINKALU, Victor Olusegun
dc.date.accessioned2021-05-20T09:03:31Z
dc.date.available2021-05-20T09:03:31Z
dc.date.issued2007-08
dc.descriptionA THESIS SUBMITTED TO THE POSTGRADUATE SCHOOL AHMADU BELLO UNIVERSITY IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE AWARD OF THE DEGREE OF MASTER OF SCIENCE IN VETERINARY PHYSIOLOGY DEPARTMENT OF PHYSIOLOGY AND PHARMACOLOGY, FACULTY OF VETERINARY MEDICINE, AHMADU BELLO UNIVERSITY, ZARIA, NIGERIAen_US
dc.description.abstractExperiments were performed with the aim of determining the fluctuations in rectal temperature (RT) of Black Harco pullets, and the effects of administration of antioxidant vitamins A, C, E and their co-administrations on the fluctuations during the hot-dry season in the Northern Guinea Savannah zone of Nigeria. The research was carried out in batches. For each batch of the experiment, the RT of 29 experimental and 20 control pullets were measured every hour from 06:00 to 19:00 hours for three days, three days apart, with a standard clinical thermometer, inserted into the rectum of each pullet. The experimental pullets in the first batch were administered with vitamin C orally in drinking water at the dose of 50 mg/kg, while the control pullets were given only water, without addition of vitamin C. The lowest hourly RT of 40.99 ± 0.040C was obtained in experimental pullets at 06:00 h, while the highest value of 41.25 ± 0.060C was recorded at 12:00 and I5:00 h (P < 0.001). In control pullets, the RT rose significantly from 41.10 ± 0.070C at 06:00 h to maximum values, ranging from 41.52 ± 0.090C to 41.72 ± 0.070C as from 10:00 to 16:00 h (P < 0.001). There was a positive and significant (P < 0.05) correlation between hours of the day and RT values, obtained in experimental (r = 0.439), and especially in control (r = 0.828) pullets. The experimental pullets in the second batch were administered with vitamin E orally at a daily dose of 30 mg/kg, while the control pullets were given only water, without the addition of vitamin E. The dry-bulb temperature was significantly and positively correlated with RT in both experimental (r = 0.800, P < 0.001) and control (r = 0.936, P < 0.001) pullets. The pullets administered with vitamin E had consistently lower RT values than those of control pullets, especially during the hot hours of the day, from 10:00 to 16:00 h. The experimental pullets in the third batch were administered with vitamin A orally at a daily dose of 1,200 IU/kg, while the control pullets were given only water, without the addition of vitamin A. The overall mean RTs for the experimental and control pullets were 41.05 ± 0.02 0C and 41.40 ± 0.06 0C, respectively (P < 0.001). This indicated that vitamin A administration reduced the risk of adverse effects of high AT and RH on the pullets during the hot-dry season. A major feature of vitamins A, C and E co-administration period was rainfall. The first rain of the year (though small; 0.3mm) fell during the period. However, the AT and RH during the period were high reaching maximum values of 40.00oC and 80.14%, respectively. The co-administration of vitamins especially A, C and E showed synergism in combating the adverse effects of heat stress in the pullets. Co-administration of vitamins A, C, and E was the most potent, followed by vitamins C and E while the least potent co-administration was vitamins E and A. The RTs of experimental and control Black Harco pullets were within the established normal range of 39.5-420C for the avian species, and they showed distinct diurnal fluctuations. It is concluded that administration of antioxidant vitamins singly or their co-administration ameliorated the thermally stressful effect of the hot-dry season in the Northern Guinea Savannah zone of Nigeria on pullets, and may enhance their productivity in the zone during the season.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/12360
dc.language.isoenen_US
dc.subjectMODULATORY ROLE,en_US
dc.subjectANTIOXIDANT VITAMINS,en_US
dc.subjectRECTAL TEMPERATURE FLUCTUATIONS,en_US
dc.subjectIN PULLETS DURING THE HOT – DRY SEASON.en_US
dc.titleMODULATORY ROLE OF ANTIOXIDANT VITAMINS ON RECTAL TEMPERATURE FLUCTUATIONS IN PULLETS DURING THE HOT – DRY SEASONen_US
dc.typeThesisen_US
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