@article{ott_freeman_poore_pickworth_2019, title={11 Impact of weaning strategy on calf performance, behavior, and activity}, volume={97}, ISSN={0021-8812 1525-3163}, url={http://dx.doi.org/10.1093/jas/skz053.027}, DOI={10.1093/jas/skz053.027}, abstractNote={Abstract
               Weaning is known to be the most stressful time in a beef calf’s post-natal life. Weaning stress may have long-term impacts on cattle performance. This study was conducted to determine differences in calf stress under three weaning strategies. Two hundred twenty-nine Angus or Angus-Simmental cross pairs at two locations were assigned to one of three weaning treatments: abrupt removal of the calf on d 0 (Abrupt, n = 77), fenceline contact for 7 d prior to removal of the calf on d 7 (Fence, n = 79), and abrupt removal of the calf on d 84 (Late, n = 73). Behavioral observations were conducted pre- and post-weaning and total activity was measured prior to and after weaning using accelerometers placed on collars on five calves per treatment. Calf weights, hip heights, and body condition scores (BCS) were collected to evaluate calf performance post-weaning. Data were analyzed using PROC MIXED of SAS. Statistical significance was determined at P < 0.05 and a tendency at 0.05<p<0.10. Skeletal growth via hip height was not affected by weaning treatment. During the first 28 d after initial weaning, the Abrupt calves lost while the Late weaned calves gained weight (-0.09 and 0.49 kg/d, respectively; P < 0.05). Fence were intermediate weight and tended to be different from both treatments (0.02 kg/d; P = 0.09). Overall ADG was not affected (P > 0.10) by timing or strategy of weaning. Total activity was greater (P < 0.05) in Abrupt than Fence on d 1 and d 2 post-wean (Abrupt 26772 and 22346 and Fence 22235 and 16691 relative activity units/hour, respectively). Calf activity was elevated (P < 0.05) on day of weaning until d 2 post-wean then returned to pre-wean level by d 3 for all treatments. Short-term differences in calf performance warrant further exploration of the possible long-term effects on heifer development and steer feedlot performance.}, number={Supplement_1}, journal={Journal of Animal Science}, publisher={Oxford University Press (OUP)}, author={Ott, Grace C and Freeman, Sharon R and Poore, Matthew H and Pickworth, Carrie L}, year={2019}, month={Jul}, pages={12–13} }
 @article{worthington_ott_poore_pickworth_2019, title={57 Impact of weaning strategy on beef cow performance}, volume={97}, ISSN={0021-8812 1525-3163}, url={http://dx.doi.org/10.1093/jas/skz053.000}, DOI={10.1093/jas/skz053.000}, abstractNote={Abstract
               It has been shown that physiologic stress in beef cattle can impact animal performance. Weaning stress is recognized as a major stress in a calf’s life. However, less is known of its impacts on the dam or developing fetus, as the dam is at the end of the second trimester at weaning. Therefore, the objective was to investigate the impact of weaning stress on cow performance. A total of 240 cows from two locations were assigned to one of three weaning strategies: abrupt removal of the calf on d 0 (n = 80), d 7 cow-calf fenceline contact (n = 81), and late weaning on d 84 (n = 79). Cows averaged 16 and 24 weeks of gestation on d 0 and d 84 respectively. Weights and BCS were obtained monthly. Behavioral observations occurred over the week before and after weaning for each weaning period. Five late-wean cows per location were milked on d 14 and d 70 to estimate milk yield throughout the late wean period. Data were analyzed using the MIXED procedure of SAS with BW and BCS utilizing repeated measures. Means are declared different at P ≤ 0.05. The ADG over the course of the study was lower (P < 0.05) for the late weaned cows compared to the abrupt weaned cows. This was also reflected by change in body condition where late weaned cows dropped from a 5.7 to a 4.9 (P < 0.05) over the 105 d. Milk production in late weaned cows decreased over time (6.0 and 4.4 kg/d for d 14 and 70, respectively; P = 0.05). Energy expenditure for lactation may have contributed to the drop in BCS of the late weaned compared with the non-lactating cows and could compromise third trimester growth of calf in utero. The results of this study warrant further exploration of the effect of weaning stress on dams and their developing fetuses.}, number={Supplement_1}, journal={Journal of Animal Science}, publisher={Oxford University Press (OUP)}, author={Worthington, Mary Clarke and Ott, Grace C and Poore, Matthew H and Pickworth, Carrie L}, year={2019}, month={Jul}, pages={1–1} }
 @article{worthington_ott_poore_pickworth_2019, title={Impact of weaning strategy on beef cow performance.}, volume={97}, ISSN={["1525-3163"]}, DOI={10.1093/jas/skz053.190}, abstractNote={Abstract
               It has been shown that physiologic stress in beef cattle can impact animal performance. Weaning stress is recognized as a major stress in a calf’s life. However, less is known of its impacts on the dam or developing fetus, as the dam is at the end of the second trimester at weaning. Therefore, the objective was to investigate the impact of weaning stress on cow performance. A total of 240 cows from two locations were assigned to one of three weaning strategies: abrupt removal of the calf on d 0 (n = 80), d 7 cow-calf fenceline contact (n = 81), and late weaning on d 84 (n = 79). Cows averaged 16 and 24 weeks of gestation on d 0 and d 84 respectively. Weights and BCS were obtained monthly. Behavioral observations occurred over the week before and after weaning for each weaning period. Five late-wean cows per location were milked on d 14 and d 70 to estimate milk yield throughout the late wean period. Data were analyzed using the MIXED procedure of SAS with BW and BCS utilizing repeated measures. Means are declared different at P ≤ 0.05. The ADG over the course of the study was lower (P < 0.05) for the late weaned cows compared to the abrupt weaned cows. This was also reflected by change in body condition where late weaned cows dropped from a 5.7 to a 4.9 (P < 0.05) over the 105 d. Milk production in late weaned cows decreased over time (6.0 and 4.4 kg/d for d 14 and 70, respectively; P = 0.05). Energy expenditure for lactation may have contributed to the drop in BCS of the late weaned compared with the non-lactating cows and could compromise third trimester growth of calf in utero. The results of this study warrant further exploration of the effect of weaning stress on dams and their developing fetuses.}, journal={JOURNAL OF ANIMAL SCIENCE}, author={Worthington, Mary Clarke and Ott, Grace C. and Poore, Matthew H. and Pickworth, Carrie L.}, year={2019}, month={Jul}, pages={83–83} }
 @article{ott_freeman_poore_pickworth_2019, title={Impact of weaning strategy on calf performance, behavior, and activity.}, volume={97}, ISSN={["1525-3163"]}, DOI={10.1093/jas/skz053.152}, abstractNote={Abstract
               Weaning is known to be the most stressful time in a beef calf’s post-natal life. Weaning stress may have long-term impacts on cattle performance. This study was conducted to determine differences in calf stress under three weaning strategies. Two hundred twenty-nine Angus or Angus-Simmental cross pairs at two locations were assigned to one of three weaning treatments: abrupt removal of the calf on d 0 (Abrupt, n = 77), fenceline contact for 7 d prior to removal of the calf on d 7 (Fence, n = 79), and abrupt removal of the calf on d 84 (Late, n = 73). Behavioral observations were conducted pre- and post-weaning, and total activity was measured prior to and after weaning using accelerometers placed on collars on five calves per treatment. Calf weights, hip heights, and body condition scores (BCS) were collected to evaluate calf performance post-weaning. Data were analyzed using PROC MIXED of SAS. Statistical significance was determined at P < 0.05 and a tendency at 0.05 0.10) by timing or strategy of weaning. Total activity was greater (P < 0.05) in Abrupt than Fence on d 1 and d 2 post-wean (Abrupt 26772 and 22346 and Fence 22235 and 16691 relative activity units/hour, respectively). Calf activity was elevated (P < 0.05) on day of weaning until d 2 post-wean then returned to pre-wean level by d 3 for all treatments. Short-term differences in calf performance warrant further exploration of the possible long-term effects on heifer development and steer feedlot performance.}, journal={JOURNAL OF ANIMAL SCIENCE}, author={Ott, Grace C. and Freeman, Sharon R. and Poore, Matthew H. and Pickworth, Carrie L.}, year={2019}, month={Jul}, pages={67–68} }
 @article{ott_freeman_poore_pickworth_2018, title={27 Maternal Stress at Weaning Impacts Calf Growth.}, volume={96}, ISSN={0021-8812 1525-3163}, url={http://dx.doi.org/10.1093/jas/sky027.028}, DOI={10.1093/jas/sky027.028}, number={suppl_1}, journal={Journal of Animal Science}, publisher={Oxford University Press (OUP)}, author={Ott, G C and Freeman, S R and Poore, M H and Pickworth, C L}, year={2018}, month={Mar}, pages={14–15} }