Effect of weaning age on pregnancy rates in Braford beef heifers bred at 13 months
Maria Eduarda Cocco Dallanóra; José Fernando Piva Lobato; Javier Alexander Bethancourt-Garcia; Mariana Assis Borges; Rangel Fernandes Pacheco; João Restle; Ricardo Zambarda Vaz
Abstract
Keywords
References
Alforma AMP, Pereira GR, da Rocha MK, Teixeira OS, Oliveira MCM, Lima JA, Cumbe TA, Barcellos JOJ. Influence of weaning management at 30, 75 and 180 days of age on non-esterified fatty acids and reproductive performance in beef cows. J Anim Physiol Anim Nutr. 2023;107(2):407-17.
Alvares CA, Stape JL, Sentelhas PC, Moraes GJL, Sparovek G. Köppen’s climate classification map for Brazil. Meteorol Z. 2013;22(6):721-8.
Barbero RP, Ribeiro ACC, Moura AM, Longhini VZ, Mattos TFA, Barbero MMD. Production potential of beef cattle in tropical pastures: a review. Cienc Anim Bras. 2021;22:e69609.
Eloy LR, Bremm C, Lobato JFP, Pötter L, Laca EA. Direct and indirect nutritional factors that determine reproductive performance of heifer and primiparous cows. PLoS One. 2022;17(10):e0275426.
Hosmer D, Lemeshow WS, Sturdivant RX. Applied logistic regression. 3rd ed. New York: John Wiley & Sons; 2013. (Wiley Series in Probability and Statistics).
Khalaf G, Iguernane M. Multicollinearity and a ridge parameter estimation approach. J Mod Appl Stat Methods. 2016;15(2):400-10.
Lalman D, Stein D. Body condition scoring of cows [Internet]. Muskogee, OK: Oklahoma Cooperative Extension Service; 2024. 4 p. [cited 2025 Apr 15]. Available from:
Landarin CM, Lobato JFP, Tarouco AK, Tarouco JU, Eloy LR, Pötter L, Rosa AAG. Growth and reproductive performance of 14- to 15-month-old Hereford heifers. Rev Bras Zootec. 2016;45(11):667-76.
Orihuela A, Galina CS. Effects of separation of cows and calves on reproductive performance and animal welfare in tropical beef cattle. Animals. 2019;9(5):223-36.
Pacheco RF, Vaz RZ, Restle J, Silveira MF, Cerdotes L, Teixeira JS, Milani L, Pacheco PS. Probability of pregnancy in beef cows with early-weaned calves. Livest Sci. 2022;257:e104854.
Reis NP, Lobato JFP, Restle J, Pacheco RF, Nuñez AJC, Sartori DBS, Vaz RZ. Effect of the performance, calving date and lactation period on the Probability of pregnancy in beef cows. Sci Agric. 2023;80:e20220088.
Restle J, Polli VA, Alves DC Fo, Senna DB, Vaz RZ, Bernardes RACL, Silva JHS. Desenvolvimento de bovinos de corte de diferentes grupos genéticos desmamados aos 3 ou 7 meses de idade. Rev Bras Zootec. 1999a;28(5):1023-30.
Restle J, Polli VA, Senna DB. Efeito de grupo genético e heterose sobre a idade e peso à puberdade e sobre o desempenho reprodutivo de novilhas de corte. Pesqui Agropecu Bras. 1999b;34(4):701-7.
Restle J, Vaz RZ, Pascoal LL, Alves DC Fo, Vaz FN, Segabinazzi LR. Desenvolvimento e desempenho reprodutivo de novilhas de corte submetidas a diferentes idades de desmame. Cienc Anim Bras. 2009;10:808-17.
Rocha MG, Lobato JFP. Avaliação do desempenho reprodutivo de novilhas de corte primíparas aos dois de idade. Rev Bras Zootec. 2002a;31(3 suppl):1388-95.
Rocha MG, Lobato JFP. Sistemas de alimentação pós-desmama de bezerras para acasalamento com 14/15 meses de idade. Rev Bras Zootec. 2002b;31(4):1814-22.
Rosa AAG, Vaz RZ, Lobato JFP. Natural and improved pastures on growth and reproductive performance of Hereford heifers. Rev Bras Zootec. 2012;41(1):203-11.
Silveira MF, Restle J, Brondani IL, Machado DS, Pacheco RF, Argenta FM, Silva VS, Hoffmann F. Effect of age and genetic group on the development of calves weaned at 63 days until one year of age. Semina: Ciênc Agrár. 2019;40(4):1631-8.
Teixeira OS, Camargo VA, Rocha MK, Alforma AMP, Sartori ED, Rosa YM, Pérez-Atehortúa M, McManus C, Barcellos JOJ. Three ages at weaning in beef calves: implications on performance and development. Rev Bras Zootec. 2024;53:e20230053.
Vaz RZ, Lobato JFP. Efeito da idade de desmame no desempenho reprodutivo de novilhas de corte expostas à reprodução aos 13/15 meses de idade. Rev Bras Zootec. 2010a;39(1):142-50.
Vaz RZ, Lobato JFP. Efeito da idade do desmame no desenvolvimento de novilhas de corte até os 14/15 meses de idade. Rev Bras Zootec. 2010b;32(2):289-98.
Vaz RZ, Lobato JFP. Effects of the weaning age of calves on somatic development and on reproductive performance of beef cows. Rev Bras Zootec. 2010c;39(5):1058-67.
Vaz RZ, Lobato JFP, Vaz FN, Restle J, Pascoal LL. Características da carcaça de novilhos desmamados aos 91 ou 160 dias terminados em pastagem e abatidos aos dezesseis meses com diferentes pesos. Cienc Anim Bras. 2011;12(1):90-100.
Vaz RZ, Restle J, Pacheco PS, Vaz FN, Pascoal LL, Vaz MB. Ganho de peso pré e pós-desmame no desempenho reprodutivo de novilhas de corte aos quatorze meses de idade. Cienc Anim Bras. 2012;13(3):272-81.
Vaz RZ, Lobato JFP, Restle J, Costa PT, Eloy LR, Ferreira OGL, Costa JLB. Calving month and calf sex on the production and efficiency of herds. Cienc Anim Bras. 2020;21:e61977.
Vaz RZ, Lobato JFP, Bethancourt-Garcia JA, Pacheco RF, Reis NP, Sartori DBS, Jappe SA, Restle J. Environmental factors on the probability of pregnancy in early or conventionally weaned beef cows. Anim Reprod. 2023;20(3):e20230054.
Submitted date:
04/15/2025
Accepted date:
10/13/2025
Facebook
LinkedIn
Mendeley
Reddit
Email