Craig N Coon

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Developmental hormonal changes in Cobb 500 chick embryos and hatched chicks were determined by measuring plasma insulin, glucagon, insulin-like growth factor (IGF)-I, IGF-II, triiodothyronine, thyroxine, and glucose concentrations at different ages of embryogenesis and posthatch development. Plasma samples were obtained daily from 10 d of embryogenesis(More)
Adult Leghorn roosters were precision-fed 44% protein soybean meal (SBM) or 80% ethanol-extracted soybean meal (ESBM) to determine nutritional differences due to the removal of oligosaccharides. Dry-matter digestibility and TMEn as well as apparent hemicellulose and cellulose digestion were determined. The transit time, rate of passage, and pH of the cecal(More)
Broiler breeder pullets were divided into two groups at 21 wk of age. One group was given free access to feed (ad libitum) and the other fed a limited amount of feed (restricted). At 22 wk, all birds were photostimulated and maintained throughout an egg-laying cycle ending at 36 wk. Samples of liver and abdominal fat pad were collected just before(More)
Experiments were conducted to examine the effect on layer performance of dietary calcium source, particle size (average United States Screen Numbers 6, 8, 12, 18, 35, and 100) and calcium intake level (2.0, 2.5, 3.0, 3.5, 4.0, and 4.5 g/day). Egg production and egg weight were not affected by any of the treatments. Size and calcium intake level(More)
In order to accurately formulate diets for broilers and laying hens to meet phosphorus requirements without overfeeding, precise knowledge of an individual feed ingredient's contribution to the retainable phosphorus is needed. Seven feed ingredients, included as the sole source of phosphorus, were tested with and without the addition of 600 phytase units(More)
A 10-d trial was conducted to investigate the relationship of Ca particle size (CPS), dietary Ca level (DCL), limestone source (LS), limestone solubility in vitro (LST) and in vivo (LSV), and limestone retention in the gizzard (LRG). A total of 120 molted Leghorn hens, 88 wk of age, were randomly assigned into a 2 x 3 x 4 factorial arrangement of treatments(More)
The objective of this study was to determine models for ME requirements for broiler breeder pullets using the factorial method. The influence of the temperature on maintenance ME requirements was determined by experiments conducted in three environmental rooms with temperature kept constant at 15,22, and 30 degrees C, using the comparative slaughter(More)
Experiments were designed to examine the sensitivity of various bone parameters of laying hens to different levels of calcium intake (2.0, 2.5, 3.0, 3.5, 4.0, and 4.5 g/day). All birds were individually fed 85 g of feed daily. Dry femur weight (DW) and absolute ash weight (AW) of the whole bone (WB), cortical bone (CB), or medullary bone (MB) were reliable(More)
Presently, phosphorus requirements are based on consumption of nonphytate phosphorus (NPP), which does not account for the fact that NPP may not be completely available and that phytate phosphorus can be partially utilized to fulfill phosphorus requirements. Phosphorus retention values for feed ingredients, accounting for NPP and phytate phosphorus, and(More)