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The effect of dietary polyunsaturated fatty acid (PUFA) concentration on body fat deposition and composition in broiler chickens was studied. Twenty-day-old birds were fed five isocaloric diets supplemented with different combinations of tallow and vegetable oils. Contents of abdominal adipose tissue (AAT) as well as body fat were determined at 40 days of(More)
Three experiments were conducted to study the effect of particle size obtained by grinding wheat and sorghum in a hammer mill (HM) or roller mill (RM) on broiler performance. Broilers were fed a mash diet or crumbles to 4 wk of age, then pellets to 7 wk of age. When fed as a mash, diets produced with RM-ground grain improved performance. The effect of(More)
Dopamine is an important retinal neurotransmitter and neuromodulator that regulates key diurnal cellular and physiological functions. In the present study we carried out a comprehensive analysis of dopamine metabolism during the light phase of the diurnal cycle and evaluated the presence of diurnal and circadian rhythms of dopaminergic activity in the mouse(More)
Homozygous 020/A mutant mice bearing the rds gene for slow inherited retinal degeneration have been observed to develop normal photoreceptor inner segments connecting cilia and synaptic contacts but fail to form outer segments. Their retinas are responsive to light, however. In order to assess the sources of these physiological responses we investigated the(More)
Adult male rats, either intact (N) or bearing complete hypothalamic deafferentations (CHD), were injected with delta 1-tetrahydrocannabinol (THC: 5 mg/kg BW, IP). Forty-five minutes later, they were decapitated and trunk blood was collected for serum ACTH and corticosterone (CS) determinations. In the N animals, serum levels of both ACTH and CS were(More)
1. In an attempt to quantify the effects of "degree" of pelleting, two experiments were conducted. Diets were prepared by mixing together a mash composed mainly of maize (experiment 1) or sorghum (experiment 2) with soft pellets, or soft pellets mixed with hard pellets. 2. The pelleting degrees (PDs) were as follows: 0 mash; 0.5 mixture of soft pellets and(More)
Chickens from three genetic stocks known to differ in growth potential consumed ad libitum either a single (control) diet or a choice of two diets that differed in protein and energy. Formulation of the choice diets was such that when mixed in specific proportions they provided single diets that decreased in protein and increased in energy over the(More)
1. Body weight and the weight of the digestive organs and activities of some digestive enzymes were determined from hatching to 23 d of age. 2. Relative daily growth rate peaked at 11 d of age (22% gain/d) and then decreased gradually. 3. The vitelline residue was decreased rapidly from 4.6 g at hatching to negligible values from 4 d of age. 4. Maximal(More)
The effect of diets prepared with corn ground in a hammer mill and sieved to obtain "coarse", "medium", and "fine" particle size fractions, on broiler performance from hatch to 7 d and from 7 to 21 d of age was studied. Five diets differing in geometric mean diameter (GMD) or geometric standard deviation (GSD) were assayed. The best performance in both age(More)
The dietary requirements for protein and amino acids of the growing gosling (0-7 weeks) were calculated according to body composition, maintenance needs and the absorption rate of amino acids from feeds. The diets were formulated by least-cost linear programming, using the calculated requirements for amino acids, with or without minimal glycine + serine(More)