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Showing 1 to 13 of 13 for “"cockerels"”.
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Celiac Blood Flow Regulation, Acid-Base Balance and Production in Heat-Stressed Cockerels (Cate Cholamines)
An acid-base disturbance characterized by reduced blood CO2 and H+ content developes in heat-stressed panting fowl. An acid-base imbalance could reduce productivity either by reducing metabolic efficiency or by depresing energy absorption by reducing gastrointestinal blood flow.
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Sex difference in the endocrine response of adult domestic chickens to gonadotrophin-releasing hormone-I
… is more prolonged, in laying hens than in adult cockerels (Callus domesticus). This thesis sought to further characterise and establish an oestrogendependency of these sex differences in vivo and in vitro, and to determine the mechanism for sexual differentiation of GnRH-I-induced LH secretion. …
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Peripheral regulation of food intake in the domestic fowl
… feeding in Single Comb White Leghorn (SCWL) cockerels. Intragastric intubations of tryptophan inhibited food intake and decreased body temperature of SCWL cockerels. These results, in conjunction with previous findings, indicate that tryptophan's inhibitory influence on food intake is …
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Central control of food intake in the domestic fowl
… from free-feeding and 24-hour fasted leghorn cockerels was lyophilized, reconstituted to 2, 4, or 5 times the original concentration, and injected, via a stereotaxically implanted 23 gauge stainless steel guide cannula, into the lateral ventricle of free-feeding leghorn cockerels. Food intake …
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Role of Histamine, and Its Interaction With Corticotropin Releasing Factor and Bombesin in Food Intake Regulation of Chickens
… Single Comb White Leghorn (SCWL) and broiler cockerels were utilized for these experiments. Birds were stereotaxically implanted with a 23-gauge thin-walled stainless steel guide cannula, and were provided a mash diet and water for ad libitum consumption. All compounds were infused into the …
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Evaluation of methodology for determination of availability of amino acids and energy in feedstuffs for poultry
… TMEn assay using conventional and cecectomized cockerels. Cecal retention of AA and effect of hindgut microbes on AA excretion were evaluated.
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The nature of skin-sensitizing antibody in the chicken (<i>Gallus domesticus</i>) upon primary immunization with bovine serum albumin (BSA)
… in the primary immune serums of White Leghorn cockerels and cocks of the B-300 strain. Tests for passive cutaneous anaphylaxis (PCA) were found to be specific and reproducible for determining the presence of this antibody when the tests were conducted in 2-4 week old cockerels of the same …
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Physical and chemical effects of pelleting feed on broiler growth and behavioral parameters
… the feeding behavior of 12-16 week old cockerels offered diets of varying particle size, resulted in significant (P ≤ .05) increases in feed consumption rate and therefore decreases in total feeding activity for birds offered pellets and crumbles as compared to mash and reground pellets. …
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Molecular responses of neonatally heat stressed broilers exposed to acute heat stress
Exposure of broiler cockerels to between 35.0 to 37.8 C for 24 hr at 5 days of age increases their survival when exposed to a heat challenge at 6 weeks of age (35.0-37.8 C; RH 50% ). This' phenomenon does not resemble acclimation since the physiological changes known to occur in acclimated birds …
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Physiological and behavioral responses of genetic lines of chickens to physical and auditory stimuli
… and production traits of White Leghorn cockerels from lines selected for high and low antibody response to sheep red blood cell antigen were measured to 70 days of age in several husbandry settings. Chicks were reared in pens with wood shavings, in windowless rooms, with continuous light …
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Effect of neonatal heat stress on growth, mortality and blood characteristics of juvenile broilers exposed to high ambient temperature
… studies indicated that exposure of broiler cockerels to acute heat for 24 hr at five days of age increased their survivability when exposed to high ambient temperature prior to market. Since they were conducted at low relative humidity, the aims of the present study were to determine if …
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Opioid regulation of ingestive behavior in the domestic fowl
… (RC) and Single-Comb White Leghorn (SCWL) cockerels. Naloxone and naltrexone decreased food and water intake in both stocks. In a separate experiment, the effect of naloxone on water intake was evaluated independent of food intake. Naloxone depressed water intake in normally hydrated and …