WorldCat Identities

Lehman, Regina N. 1984-

Works: 2 works in 2 publications in 1 language and 2 library holdings
Roles: Author
Publication Timeline
Most widely held works by Regina N Lehman
The effect of dietary phytic acid concentration and phytase supplementation on performance, bone ash, and intestinal health of broilers vaccinated with a live coccidial oocyst vaccine by Regina N Lehman( )

1 edition published in 2011 in English and held by 1 WorldCat member library worldwide

The role of nutrition in providing optimal broiler growth and intestinal health is essential, especially during stress or disease challenge. Feed enzymes are useful for improving performance of poultry, particularly when nutrition, management, or health status is not favorable. The objective of the following experiments was to evaluate the effect of dietary phytic acid (PA) and phytase on the performance and intestinal health of birds that were vaccinated with a live coccidial oocyst vaccine. For each experiment, half of the chicks were spray-vaccinated at day-of-hatch with Coccivac[R]-B and grown out in floor pens with ad libitum access to diets formulated to meet Cobb nutrient recommendations. In the first experiment, birds were given one of three diets that included different levels of a PA solution to obtain dietary PA levels of 0.74, 0.87, and 1.12% for low, medium, and high PA diets, respectively. In the second experiment, two levels of PA were included to obtain dietary PA levels of 0.75 and 1.05% for low and high PA diets, respectively. In addition, phytase was added over the top to half of the diets at 1000 FTU/kg, resulting in four diets: low PA without phytase, low PA with phytase, high PA without phytase, and high PA with phytase. Live performance parameters including body weight, body weight gain, feed intake, feed conversion, and mortality were measured as well as tibia ash (experiment 2) and indicators of small intestinal health including morphology, apparent ileal amino acid digestibility (IAAD), and pH (experiment 2). The results presented here indicated that giving broilers vaccinated against coccidiosis a medium level of PA was detrimental to feed intake, body weight gain, and it induced necrotic enteritis (P </= 0.05). Adding phytase on top of nutritionally adequate diets did not improve performance (P>/= 0.05), but did improve (P </= 0.05) apparent IAAD and morphology of the small intestine, especially in younger birds. In addition, it has been determined that important considerations in diet formulation also can include the phytate: protein as well as calcium: total phosphorus ratios, as these may critically affect how phytate impacts bird health and performance
The effect of gelatin and dietary crude protein level on broilers vaccinated for coccidiosis by Regina N Lehman( )

1 edition published in 2008 in English and held by 1 WorldCat member library worldwide

Vaccinating for coccidiosis adversely affects live performance of broilers compared to dietary anticoccidial. Feeding diets with higher crude protein alleviates negative response to vaccination, presumably by providing the bird with the amino acids essential for recovery. Experiments were conducted to evaluate whether gelatin, as a source of proline and glycine, aided in recovery of vaccinated birds compared to coccidiostat-protected birds fed low and high crude protein diets; and to estimate a crude protein level where use of gelatin is optimized in diets of vaccinated broilers. In the first experiment, male and female broiler chicks were fed either a low or high crude protein (CP) diet from 0-8 weeks of age with limiting EAA levels meeting or exceeding NRC (1994) recommendations. Gelatin was included in half of the diets at 2% to increase proline and glycine. Half of the birds were vaccinated and the rest were protected with a dietary coccidiostat. Vaccination adversely affected performance during the first 3 weeks. Addition of gelatin reduced the early negative response of vaccinated birds, but by 8 weeks, vaccinated birds still had reduced gain and carcass weight compared to coccidiostat-protected birds. Addition of gelatin to low CP diets improved feed conversion to that of birds fed the high CP diets; however carcass yield of low CP diets was not improved with addition of gelatin. The second experiment was performed to estimate the optimal levels of crude protein and NEAA of vaccinated male broilers. Diets with graded levels of crude protein: 20, 21, 22, or 23% from 0-3 weeks; 19, 20, 21, or 22% from 3-6 weeks; and 18, 19, 20, or 21% from 6-8 weeks, respectively, were administered from 0-8 weeks of age, half of which contained 2% gelatin to increase proline and glycine. Increasing CP improved body weight gain while gelatin inclusion generally improved feed conversion. Carcass yield was increased and abdominal fat decreased with CP, but gelatin resulted in greater abdominal fat without affecting meat yield of the carcass. Additional NEAA, provided by gelatin and CP, generally improve performance of vaccinated birds, although specific estimates could not be determined
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