Pale, soft and exudative (PSE) meat is a major meat quality problem in the turkey processing industry. Its causes are likely rooted in both genetics and management. The purpose of this study is to test the hypothesis that a defect in one or both sarcoplasmic reticulum Ca 2+ chan…
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The purpose of the research was to study photoperiodism and endocrine control of reproduction in domestic turkeys. In female turkeys, plasma levels of luteinizing hormone (LH) were high at hatch, then declined to low levels at about 10 weeks of age, then rebounded to high levels…
Four experiments were conducted on hens of turkey and Japanese quail. In Experiment I, turkey hens were fed diets containing either 0% added fat, 3.5% animal-vegetable fat blend (AV) or 3.5% dry fat product (DF). In Experiment II with turkey hens, 2 holding diets and 4 breeder d…
The overall objective of this dissertation was to evaluate the effects of dietary fiber and short-chain fatty acids on enterocyte differentiation, maturation, and susceptibility to coronavirus infection in turkeys. Initial work involved the development of an indirect immunoperox…
The purpose of this research was to understand developmental patterns of intestinal glucose transport and its role in functional aspects of growth in turkeys. The objective of the first study was to examine developmental patterns of glucose transport in turkeys and to compare di…
Three experiments were conducted to test different dietary concentrations and different sources of vitamin E (VE) to reevaluate the dietary requirement of VE for young turkeys, and to determine whether an early high dose of VE given either by subcutaneous injection or added to t…
High concentration of plasma prolactin (PRL) or hyperprolactinemia has long been associated with the expression of incubation behaviour in galliforme species. Incubation behaviour is selected against in commercial turkey production because this maternal behaviour reduces egg pro…
An experiment involving 96 turkeys was carried out in conventional battery cages. The purpose of this experiment was to determine the effect of lactose on the productive performance of turkeys. Another objective was to establish the optimum level of inclusion in the diet. Birds …
Chickens have been sexed on the basis of feather development at hatching for many years, but the slow feathering gene has only recently been incorporated into a commercial line of turkeys. The effect of increased nutrient density and age at photostimulation on BW, feather cover,…
During the first stage of this study, a complete statistical analysis was performed on condemnation records from 1991-1997 at the four main processing plants in Ontario. Results of this part of the investigation indicated that airsacculitis was responsible for 14-36.5 percent of…
Four experiments were conducted with broiler chicks and turkey poults to examine the possible interactions among fat-soluble vitamins. The first and the fourth experiments were conducted with L. W., Nicholas strain, poults and the second and the third experiments were conducted …
Turkey breeding stock consists of male-lines, which contribute the growth and carcass traits, and female lines, which contribute the reproductive traits. A negative relationship exists between increased body size and reproductive efficiency in turkeys. The influence of feed allo…
Two experiments were conducted to induce an immune stress in newly hatched turkeys by injection of lipopolysaccharide (LPS) and to study the effects of the induction of this early immune stress and changes in the nitrogen-corrected metabolizable energy (MEn) of the diet on growt…
Ninety large white turkey hens housed in individual cages were fed a 16 percent protein breeder diet during the first 10 weeks of egg production. At the start of the 11th week of egg production the hens were fed either (1) 16 percent protein, (2) 16 percent protein plus zinc bac…
Observations on domestic poults with wild turkey hens and various pilot experiments showed that: (1) the hen plays a minimal role in motivating/directing feeding and may indirectly inhibit some feeding behaviours; (2) bouts of feeding alternated with rest, suggesting post-hatch …
Enteric disorders are becoming of increasing concern to the poultry industry. The causative agents of enteric diseases in turkeys include bacteria, viruses, parasites and antinutritional factors present naturally in feedstuffs. There were two general objectives of research repor…