Search Results - "Pearson, R.E."

Modeling extended lactations of Holsteins by Dematawewa, C M B, Pearson, R E, Vanraden, P M

“…Modeling extended lactations for the US Holsteins is useful because a majority (>55%) of the cows in the present population produce lactations longer than 305…”
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Effect of incomplete pedigrees on estimates of inbreeding and inbreeding depression for days to first service and summit milk yield in Holsteins and Jerseys by Cassell, B G, Adamec, V, Pearson, R E

“…A method to measure completeness of pedigree information is applied to populations of Holstein (registered and grade) and Jersey (largely registered) cows…”
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Disappearance of infused phytate from the large intestine of dairy heifers by Ray, P P, Shang, C, Pearson, R E, Knowlton, K F

“…The objective of this study was to investigate the disappearance of phytate from the large intestine of dairy heifers. Uncertainty about the availability of…”
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Lactation performance of mid-lactation dairy cows fed ruminally degradable protein at concentrations lower than national research council recommendations by Cyriac, J, Rius, A G, McGilliard, M L, Pearson, R E, Bequette, B J, Hanigan, M D

“…The aim of this study was to test whether feeding of diets containing lower proportions of ruminally degradable protein (RDP) but with a constant proportion of…”
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Timing of insemination for dairy cows identified in estrus by a radiotelemetric estrus detection system by Dransfield, M B, Nebel, R L, Pearson, R E, Warnick, L D

“…The optimal time of artificial insemination (AI) was determined from data for 2661 AI in 17 herds utilizing a radiotelemetric system for estrus detection that…”
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Effect of droplet vitrification on development competence, actin cytoskeletal integrity and gene expression in in vitro cultured mouse embryos by Dhali, A., Anchamparuthy, V.M., Butler, S.P., Pearson, R.E., Mullarky, I.K., Gwazdauskas, F.C.

“…The effect of modified droplet vitrification was assessed on cellular actin filament organization, apoptosis related gene expression and development competence…”
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Gene expression and development of mouse zygotes following droplet vitrification by Dhali, A., Anchamparuthy, V.M., Butler, S.P., Pearson, R.E., Mullarky, I.K., Gwazdauskas, F.C.

“…The concept of ultra-rapid vitrification has emerged in recent years; the accelerated cooling rate reduced injury attributed to cryopreservation and improved…”
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The effects of inbreeding on the lifetime performance of dairy cattle by Smith, L A, Cassell, B G, Pearson, R E

“…The effects of inbreeding on the lifetime performance of dairy cattle were examined using data for production, somatic cell score, and linear type for all…”
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Comparison of three estrus detection systems during summer in a large commercial dairy herd by Peralta, O.A., Pearson, R.E., Nebel, R.L.

“…The objective of the study was to compare three systems for estrus detection and combinations of these systems on a large commercial dairy (1075 lactating…”
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Effect of exogenous somatotropin in Holstein calves on mammary gland composition and proliferation by Huderson, B P, Velayudhan, B T, Pearson, R E, Ellis, S E, Akers, R M

“…Pubertal mammary gland growth and development are hormonally regulated, but the details are poorly understood in calves. Our purpose was to evaluate the…”
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Productive life including all lactations and longer lactations with diminishing credits by VanRaden, P M, Dematawewa, C M B, Pearson, R E, Tooker, M E

“…Alternative measures of productive life (PL) were compared, and life expectancy factors were updated to replace estimates from 1993. Alternatives were proposed…”
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Maternal and fetal inbreeding depression for 70-day nonreturn and calving rate in Holsteins and Jerseys by Cassell, B G, Adamec, V, Pearson, R E

“…Inbreeding depression for 70-d nonreturn rate was estimated in 50,613 Holstein and 47,673 Jersey cows with five-generation pedigrees using an animal model…”
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In vitro development of bovine embryos cultured with stem cell factor or insulin-like growth factor-I following IVF with semen of two bulls having different field fertility by Dhali, A., Anchamparuthy, V.M., Butler, S.P., Pearson, R.E., Gwazdauskas, F.C.

“…The usefulness of IVF as a potential tool to evaluate the field fertility of bulls is equivocal and growth factor addition to culture media research is needed…”
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Assessment of pronuclear formation following in vitro fertilization with bovine spermatozoa obtained after thermal insulation of the testis by Walters, A.H., Saacke, R.G., Pearson, R.E., Gwazdauskas, F.C.

“…This study was conducted to follow the chronology of pronuclear formation in bovine zygotes after in vitro insemination with a population of spermatozoa having…”
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Effects of energy balance of hormones, ovarian activity, and recovered oocytes in lactating Holstein cows using transvaginal follicular aspiration by Kendrick, K W, Bailey, T L, Garst, A S, Pryor, A W, Ahmadzadeh, A, Akers, R M, Eyestone, W E, Pearson, R E, Gwazdauskas, F C

“…The effects of energy balance on hormonal secretion patterns and the structure of recovered oocytes were evaluated in 20 lactating Holstein cows during two…”
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The incidence of apoptosis after IVF with morphologically abnormal bovine spermatozoa by Walters, A.H., Saacke, R.G., Pearson, R.E., Gwazdauskas, F.C.

“…Normal embryonic development depends on the maintenance of a population of normal healthy cells within each embryo. The aim of this study was to use a…”
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Pregnancy rates after timed AI of heifers following removal of intravaginal progesterone inserts by Peeler, I D, Nebel, R L, Pearson, R E, Swecker, W S, Garcia, A

“…Reproductive performance of dairy heifers was compared for each of 2 synchronization protocols: The first group of 54 heifers was synchronized using…”
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Parity-related changes in bovine follicle and oocyte populations, oocyte quality, and hormones to 90 days postpartum by Walters, A H, Bailey, T L, Pearson, R E, Gwazdauskas, F C

“…Ultrasound-guided transvaginal follicular aspiration was used to obtain oocytes from Holstein cows to study follicular development and oocyte morphology during…”
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Milk yield, energy balance, hormone, follicular and oocyte measures in early and mid-lactation Holstein cows by Walters, A.H, Pryor, A.W, Bailey, T.L, Pearson, R.E, Gwazdauskas, F.C

“…The purpose of the study was to determine the influence of energy status on metabolic and endocrine measures, follicular development, and the quality of…”
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A local increase in the mammary IGF-1: IGFBP-3 ratio mediates the mammogenic effects of estrogen and growth hormone by Berry, S.D., McFadden, T.B., Pearson, R.E., Akers, R.M.

“…A single epithelium-free mammary fat pad was surgically prepared in each of twenty-five one-month-old, Friesian heifers. At 18 mo of age, heifers were randomly…”
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