Search Results - "Tozer, P.R."

Using activity and milk yield as predictors of fresh cow disorders by Edwards, J L, Tozer, P R

“…The objective was to determine whether daily walking activity and milk yields could be used as predictors of metabolic and digestive disorders early in…”
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Development and analysis of a rumen tissue sampling procedure by Lesmeister, K E, Tozer, P R, Heinrichs, A J

“…A procedure for rumen tissue sampling was developed to determine treatment effects on rumen development and papillae growth in young calves and to improve…”
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Identifying efficient dairy producers using data envelopment analysis by Stokes, J R, Tozer, P R, Hyde, J

“…The objective of this research was to calculate the efficiency of a group of Pennsylvania dairy farms to determine factors that contributed to efficiency in…”
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Induced lactation in pubertal heifers: efficacy, response to bovine somatotropin, and profitability by Macrina, A L, Tozer, P R, Kensinger, R S

“…Heifer rearing represents one of the largest costs of commercial dairying because these animals do not begin to produce milk until approximately 2 yr of age…”
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What affects the costs of raising replacement dairy heifers: a multiple-component analysis by Tozer, P R, Heinrichs, A J

“…A DP model of a dairy replacement herd was developed to analyze the impact of different dairy and replacement herd variables on the cost of rearing…”
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Economic analyses of feeding systems combining pasture and total mixed ration by Tozer, P R, Bargo, F, Muller, L D

“…Partial budgeting was used to compare net incomes of high-yielding Holstein cows fed either a total mixed ration (TMR), a pasture-based diet, or a combination…”
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Stability, resilience and sustainability in pasture-based grazing systems by Kaine, G.W., Tozer, P.R.

“…In this paper we employ a simple dynamic simulation model to illustrate and extend the pasture envelope concept as an approach to characterising the stability,…”
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The effect of pasture allowance and supplementation on feed efficiency and profitability of dairy systems by Tozer, P R, Bargo, F, Muller, L D

“…Partial budgeting was used to compare income over feed costs of high-yielding Holstein cows based on data from an experiment with 4 dietary treatments arranged…”
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Least-cost ration formulations for Holstein dairy heifers by using linear and stochastic programming by Tozer, P R

“…Four mathematical programming models were developed to formulate rations for large breed replacement dairy heifers in each of 11 different weight classes from…”
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A multi-objective programming approach to feed ration balancing and nutrient management by Tozer, P.R., Stokes, J.R.

“…This paper examines the potential to use multiple objective programming to reduce nutrient excretion from dairy cows through incorporation of nutrient…”
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Simulating use of terminal sires in a self-replacing beef suckler herd with varying weaning rate, calf sale policies, and price premiums by Farrell, L.J., Morris, S.T., Kenyon, P.R., Tozer, P.R.

“…•Using terminal sires in a beef cow herd increases sale prices and feed demand per animal sold.•Selling more of cattle direct to slaughter necessitated…”
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The effect of ewe wastage in New Zealand sheep and beef farms on flock productivity and farm profitability by Farrell, L.J., Tozer, P.R., Kenyon, P.R., Ramilan, T., Cranston, L.M.

“…Changes in the relative value of meat and coarse wool have led to the majority of income for New Zealand sheep farms now coming from the sale of animals for…”
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Quantifying sheep enterprise profitability with varying flock replacement rates, lambing rates, and breeding strategies in New Zealand by Farrell, L.J., Kenyon, P.R., Tozer, P.R., Ramilan, T., Cranston, L.M.

“…Sheep sales are the major source of income for most New Zealand sheep enterprises. Terminal (meat breed) sires are used to increase lamb growth rates enabling…”
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Producing higher value wool through a transition from Romney to Merino crossbred i: Flock dynamics, feed demand, and production of lambs and wool by Farrell, L.J., Tozer, P.R., Kenyon, P.R., Ramilan, T., Cranston, L.M.

“…•Bio-economic system-dynamics modelling of a Romney flock bred with Merino sires for whole flock breed transition.•With low selection intensity, the transition…”
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Producing higher value wool through a transition from Romney to Merino crossbred ii: Cashflow and profit by Farrell, L.J., Tozer, P.R., Kenyon, P.R., Ramilan, T., Cranston, L.M.

“…•Bio-economic system-dynamics modelling of a Romney flock bred with Merino sires for whole flock breed transition.•Profit decreased during transition, but was…”
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Development of a cost analysis spreadsheet for calculating the costs to raise a replacement dairy heifer by Gabler, M T, Tozer, P R, Heinrichs, A J

“…Dairy operations have a variety of resources and objectives, such that the most economical method of obtaining replacement heifers is only determined by…”
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Producer breeding objectives and optimal sire selection by Tozer, P R, Stokes, J R

“…Information from an online survey of dairy producers was used to determine how important producers perceived three different objectives in the breeding…”
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Using multiple objective programming in a dairy cow breeding program by Tozer, P R, Stokes, J R

“…Multiple-objective programming was used to examine the effects various objectives had on the optimal portfolio of sires chosen for a given breeding problem in…”
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Cost minimization and managing soil nutrient loading: conflict or compromise? by Stokes, J.R, Tozer, P.R

“…The consolidation of agricultural operations over time has led to fewer, larger farms. For livestock operations, this consolidation has also led to higher…”
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Recursive systems model of fetal birth weight and calving difficulty in beef heifers by Tozer, P.R, Scollard, D.L, Marsh, T.L, Marsh, T.J

“…The purpose of this study was to use readily available information, including dam pelvic width (PW) and height (PH) and the fetal coronet band (CB) measurement…”
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