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Full-Text Articles in Life Sciences

Managing Annual Cow Costs, Julie Walker Jan 2013

Managing Annual Cow Costs, Julie Walker

Animal Science Faculty Publications

Published in Proceedings of the 23rd Range Beef Cow Symposium- Rapid City, SD.


Effect Of An Injection Of Gnrh At Time Of Insemination Following Detection In Standing Estrus On Beef Cow And Heifer Pregnancy Rates, G. A. Perry Jan 2006

Effect Of An Injection Of Gnrh At Time Of Insemination Following Detection In Standing Estrus On Beef Cow And Heifer Pregnancy Rates, G. A. Perry

South Dakota Beef Report, 2006

An injection of GnRH at the initiation of standing estrus has been reported to increase pregnancy and circulating concentrations of progesterone in repeat breeder dairy cows, cows that have normal estrous cycles but will not conceive. The objective of this study was to determine the effect of administering an injection of GnRH at time of insemination on subsequent concentrations of progesterone and conception rates in beef cattle that have exhibited standing estrus. Eighty-two beef heifers at 2 locations were synchronized with the Select Synch-CIDR protocol (n = 42) or the 14-19 MGA protocol (n = 40) and AI was performed following detection ...


Energetic Response Of Angus And Simmental Crossbred Cows To Low And Moderate Intakes, C. P. Birkelo, B. M. Freking, D. M. Marshall Jan 1995

Energetic Response Of Angus And Simmental Crossbred Cows To Low And Moderate Intakes, C. P. Birkelo, B. M. Freking, D. M. Marshall

South Dakota Beef Report, 1995

Mature Angus-Hereford (AH; n = 15) and Simmental-Hereford (SH; n = 16) cows were used to evaluate the effects of adaptation to moderate (adequate to at least maintain body condition) and low (76% of moderate) intakes on feed energy partitioning by cows of different genotypes. Cows were fed individually in drylot for one complete production cycle (1 2 months). Conventional energy balance techniques and respiration calorimetry were used once during gestation and twice during lactation to evaluate energy utilization. Condition scores differed by .7 units (5.0 vs 4.3; P< .001) between intake levels by the end of the study. Heat production at 195 days of gestation was affected by intake level (P< .001) but not by genotype (P> .20), and there was no interaction between the main effects (Gxl ...


Effect Of Weaning Date On Performance Of Beef Cows, R. J. Pruitt, P. A. Momont Jan 1994

Effect Of Weaning Date On Performance Of Beef Cows, R. J. Pruitt, P. A. Momont

South Dakota Beef Report, 1994

Records from 92 mature crossbred cows calving in March and April were used to determine the effect of weaning calves 40 days earlier than the traditional weaning time on cow weight change, body condition, and reproductive performance. When calves were weaned early (September 14 versus October 231, their dams gained more weight from September 14 to early December and had higher body condition scores in December than the dams of later weaned calves. The two nutritional treaments imposed after calving were important in explaining the effects of earlier weaning on cow reproductive performance. For cows that were fed grass hay ...


Serum D-Β-Hydroxybutyrate And Urea Nitrogen As Indicators Of Beef Cow Nutritional Status, P.A. Momont, R.J. Pruitt, R.H. Pritchard Jan 1988

Serum D-Β-Hydroxybutyrate And Urea Nitrogen As Indicators Of Beef Cow Nutritional Status, P.A. Momont, R.J. Pruitt, R.H. Pritchard

South Dakota Beef Report, 1988

Mature Simmental x Angus crossbred cows were fed differing levels of nutrition before and after calving (mid-March to early May) to determine if blood serum levels of d-β-hydroxybutyrate (BHB) and urea nitrogen (SUN) could be used as indicators of nutritional status. Visual condition scores and condition score change were used as subjective appraisals of cow nutritional status. BHB levels prior to calving were elevated for cows close to calving and those carrying male fetuses. SUN levels prior to calving were higher for thin cows that were losing body condition. If on a low plane of nutrition after calving, BHB values ...


Relationships Between Body Condition Scores And Live Animal Measurements Of Beef Cows, P.A. Momont, R.J. Pruitt Jan 1988

Relationships Between Body Condition Scores And Live Animal Measurements Of Beef Cows, P.A. Momont, R.J. Pruitt

South Dakota Beef Report, 1988

Records from 133 mature Simmental x Angus cows collected over a 3-year period were used to determine the relationships between body condition scores and other measurements of cow body condition. Positive correlations were found between condition scores and backfat, weight/height ratios and cow weight. Correcting weight/height ratios of pregnant cows for weight of the conceptus did not improve the correlations with condition score. Backfat measurements had limited use in describing body condition, since backfat wasnear zero for cows less than condition score 5. Equations using condition scores accurately predicted weight/height ratios.


Effects Of Cow Body Condition And Calving Date On Calf Performance, P.A. Momont, R.J. Pruitt Jan 1988

Effects Of Cow Body Condition And Calving Date On Calf Performance, P.A. Momont, R.J. Pruitt

South Dakota Beef Report, 1988

Records from 285 Charolais-sired calves out of 133 Simmental x Angus crossbred cows taken over 3 years were used to evaluate the influence of cow body condition at calving, condition score change following calving and calf birth date on calf performance. Calves nursing cows with higher condition scores in March had increased daily gains from birth until May. However, at weaning time average daily gain and weaning weights were similar regardless of cow condition at calving. Cows which maintained body condition or lost less than two condition scores from March to May weaned heavier calves than cows which lost two ...


Effects Of Body Condition On Reproductive Performance Of Range Beef Cows, R.J. Pruitt, P.A. Momont Jan 1988

Effects Of Body Condition On Reproductive Performance Of Range Beef Cows, R.J. Pruitt, P.A. Momont

South Dakota Beef Report, 1988

Mature Simnnental x Angus crossbred cows were fed differing Levels of nutrition from December to May in each of 3 years to create a wide range in cow body condition or fleshiness at the beginning of the calving season (beginning mid-March) and when turned to summer pasture (early May)1 month prior to the beginning of a 60-day breeding season ( early June). Cows that were fleshier in March, May or June cycled earlier and conceived earlier. Being thin in May or June had a more detrimental effect on pregnancy rate for cows that calved late in the calving season. A ...


Effects Of Body Condition On Reproductive Performance Of Range Beef Cows, R.J. Pruitt, P.A. Momont Jan 1987

Effects Of Body Condition On Reproductive Performance Of Range Beef Cows, R.J. Pruitt, P.A. Momont

South Dakota Beef Report, 1987

Simnental-Angus crossbred cows were fed differing Levels of nutrition from December to May in each of 3 years to create a wide range in cow body condition or fleshiness at the beginning of the calving season (beginning mid-March) and when turned to summer pasture (early May) 1 month prior to the beginning of the breeding season (early June). Cows that were fleshier in March, May or June cycled earlier. Cows that were fleshier at the beginning of the breeding season calved earlier the following years. For cows that calved Late in the calving season, body condition prior to calving, in ...


Effects Of Body Condition On Reproductive Performance Of Beef Cows, P.A. Momont, R.J. Pruitt Jan 1986

Effects Of Body Condition On Reproductive Performance Of Beef Cows, P.A. Momont, R.J. Pruitt

South Dakota Beef Report, 1986

Cows were fed differing nutritional levels before and after calving to create a wide range of cow body condition or fleshiness prior t o calving and at the beginning of the breeding season. Cows that were fleshier prior t o calving and when turned on pasture in early May (30 days prior t o the beginning of the breeding season) had a higher cycling rate in early May, June and July. Cows maintaining or increasing slightly in body condition (precalving to early May) tended to have a higher cycling rate during the breeding season than cows which lost body condition ...


Effects Of Level Of Energy Supplement In Early Winter And Level Protein After Calving On Beef Cows Grazing Native Range, R.J. Pruitt Jan 1986

Effects Of Level Of Energy Supplement In Early Winter And Level Protein After Calving On Beef Cows Grazing Native Range, R.J. Pruitt

South Dakota Beef Report, 1986

Simmental-Angus crossbred cows grazing native range near Cottonwood, SD, were fed two precalving levels of energy supplement and two postcalving levels of protein supplement. Cow weight change and reproductive performance were similar for all treatments. Although calves from cows supplemented with higher levels of energy gained faster from birth to early May, gains to weaning were similar for all treatments.