TL;DRAbstract
Two experiments were conducted to determine the influence of biostimulation on the occurrence of puberty in beef heifers.In Experiment I the objective was to determine if prostaglandin F2 (PGF2 ; 25 mg/head) and/or biostimulation and social interaction of prepuberal heifers with a group of estrous heifers (n=49) could induce first estrus in prepuberal heifers.Angus (A), Hereford (H) and AxH heifers (n=372), approximately 13 months of age,-were stratified within breed by weight to the following treatment groups: I) heifers injected with PGF2 and isolated from estrous heifers (n=91); 2) heifers injected with PGF2 and placed with estrous heifers (n=97); 3) heifers injected with .9%saline and isolated (n=95); and 4) heifers injected with .9%saline and placed with estrous heifers (n=8 9).Isolation groups were placed .5 km away from groups containing estrous females.Heifers were observed for behavioral estrus twice daily fbr 21 days after initiation of treatments.Percentages of heifers exhib
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Two experiments were conducted to determine the influence of biostimulation on the occurrence of puberty in beef heifers.In Experiment I the objective was to determine if prostaglandin F2 (PGF2 ; 25 mg/head) and/or biostimulation and social interaction of prepuberal heifers with a group of estrous heifers (n=49) could induce first estrus in prepuberal heifers.Angus (A), Hereford (H) and AxH heifers (n=372), approximately 13 months of age,-were stratified within breed by weight to the following treatment groups: I) heifers injected with PGF2 and isolated from estrous heifers (n=91); 2) heifers injected with PGF2 and placed with estrous heifers (n=97); 3) heifers injected with .9%saline and isolated (n=95); and 4) heifers injected with .9%saline and placed with estrous heifers (n=8 9).Isolation groups were placed .5 km away from groups containing estrous females.Heifers were observed for behavioral estrus twice daily fbr 21 days after initiation of treatments.Percentages of heifers exhib
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