Enfriamiento artificial y tasa de concepción de vaquillas Holstein con estrés térmico

Translated title of the contribution: Cooling and conception rate in Holstein heifers with heat stress

A. Correa-Calderón, G. des Santos, L. Avendaño, F. Rivera, D. Alvarez, F. Ardon, R. Diaz, Robert J Collier

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The objective of this study was to evaluate the effect of a timed artificial insemination protocol plus a period of artificial cooling on conception rate and physiologic response of heifers under heat stress. Ninety Holstein heifers were randomly allotted into one of three treatments: A control treatment (T1) with visual heat detection and insemination morning-evening (n=30), a second treatment (T2) under a timed artificial insemination protocol and a third treatment (T3) with the same protocol than T2 plus an artificial cooling period beginning 11 d before and ending 21 d after insemination. The experiment was divided in two periods: the first period was from June 25 to July 26, and the second one from August 15 to September 16. In period 1, heifers in T3 had a lower (p<0.01) rectal temperature (39.35°C) compared to T1 (39.68°C) and T2 (39.67°C); respiration rate (breaths/min) was more reduced (p<0.01) in T3 (72) in comparison to T1 (85) and T2 (84). Conception rate was not different between T3 (64.3%) and T1 (46.7%) but both showed a tendency to be different (p<0.10) to T2 (13.3%). During the period 2, the rectal temperature in T3 (39.24°C) was lower (p<0,01) than T1 (39.61°C) and T2 (39.62°C). Respiration rate also was decreased (p<0,01) in T3 (77) with respect to T1 (87) and T2 (94), being T1 and T2 different (p<0.01). Conception rate was similar between T3 (40%), T1 (13%) and T2 (13%). The pregnancy rate including both periods had a tendency to be increased (p<0,10) in T3 (51.7%) compared to T2 (13.3%) and T1 (30.0%). The artificial insemination to fixed time plus artificial cooling may be an alternative to increase the fertility of Holstein heifers during the summer.

Original languageUndefined/Unknown
Pages (from-to)231-239
Number of pages9
JournalArchivos de Zootecnia
Volume58
Issue number222
StatePublished - Jun 2009

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conception rate
heat stress
heifers
Holstein
cooling
artificial insemination
respiratory rate
insemination
pregnancy rate
temperature
heat
summer

Keywords

  • Estrus synchronization
  • Fertility
  • Fogging
  • Ventilation

ASJC Scopus subject areas

  • Animal Science and Zoology

Cite this

Correa-Calderón, A., des Santos, G., Avendaño, L., Rivera, F., Alvarez, D., Ardon, F., ... Collier, R. J. (2009). Enfriamiento artificial y tasa de concepción de vaquillas Holstein con estrés térmico. Archivos de Zootecnia, 58(222), 231-239.

Enfriamiento artificial y tasa de concepción de vaquillas Holstein con estrés térmico. / Correa-Calderón, A.; des Santos, G.; Avendaño, L.; Rivera, F.; Alvarez, D.; Ardon, F.; Diaz, R.; Collier, Robert J.

In: Archivos de Zootecnia, Vol. 58, No. 222, 06.2009, p. 231-239.

Research output: Contribution to journalArticle

Correa-Calderón, A, des Santos, G, Avendaño, L, Rivera, F, Alvarez, D, Ardon, F, Diaz, R & Collier, RJ 2009, 'Enfriamiento artificial y tasa de concepción de vaquillas Holstein con estrés térmico', Archivos de Zootecnia, vol. 58, no. 222, pp. 231-239.
Correa-Calderón A, des Santos G, Avendaño L, Rivera F, Alvarez D, Ardon F et al. Enfriamiento artificial y tasa de concepción de vaquillas Holstein con estrés térmico. Archivos de Zootecnia. 2009 Jun;58(222):231-239.
Correa-Calderón, A. ; des Santos, G. ; Avendaño, L. ; Rivera, F. ; Alvarez, D. ; Ardon, F. ; Diaz, R. ; Collier, Robert J. / Enfriamiento artificial y tasa de concepción de vaquillas Holstein con estrés térmico. In: Archivos de Zootecnia. 2009 ; Vol. 58, No. 222. pp. 231-239.
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abstract = "The objective of this study was to evaluate the effect of a timed artificial insemination protocol plus a period of artificial cooling on conception rate and physiologic response of heifers under heat stress. Ninety Holstein heifers were randomly allotted into one of three treatments: A control treatment (T1) with visual heat detection and insemination morning-evening (n=30), a second treatment (T2) under a timed artificial insemination protocol and a third treatment (T3) with the same protocol than T2 plus an artificial cooling period beginning 11 d before and ending 21 d after insemination. The experiment was divided in two periods: the first period was from June 25 to July 26, and the second one from August 15 to September 16. In period 1, heifers in T3 had a lower (p<0.01) rectal temperature (39.35°C) compared to T1 (39.68°C) and T2 (39.67°C); respiration rate (breaths/min) was more reduced (p<0.01) in T3 (72) in comparison to T1 (85) and T2 (84). Conception rate was not different between T3 (64.3{\%}) and T1 (46.7{\%}) but both showed a tendency to be different (p<0.10) to T2 (13.3{\%}). During the period 2, the rectal temperature in T3 (39.24°C) was lower (p<0,01) than T1 (39.61°C) and T2 (39.62°C). Respiration rate also was decreased (p<0,01) in T3 (77) with respect to T1 (87) and T2 (94), being T1 and T2 different (p<0.01). Conception rate was similar between T3 (40{\%}), T1 (13{\%}) and T2 (13{\%}). The pregnancy rate including both periods had a tendency to be increased (p<0,10) in T3 (51.7{\%}) compared to T2 (13.3{\%}) and T1 (30.0{\%}). The artificial insemination to fixed time plus artificial cooling may be an alternative to increase the fertility of Holstein heifers during the summer.",
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