Effects of Synovex C implants on growth rate, pelvic area, reproduction, and calving performance of replacement heifers.

R. F. Hancock, G. H. Deutscher, M. K. Nielsen, D. J. Colburn

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Two trials were conducted to evaluate effects of Synovex C implants on replacement heifers, given at two different ages. Crossbred heifer calves (n = 370) were allotted to four treatments: 1) nonimplanted controls, 2) implanted at 2 mo, 3) implanted at 6 mo, and 4) implanted at both 2 and 6 mo of age. Heifers implanted at 2 mo gained 7 kg more (P = .01) by 6 mo than those not implanted at 2 mo. No differences were found in 22-mo weights. All implanted heifers had larger (P = .01) yearling pelvic area than controls. All heifers implanted at 6 mo continued to have larger (P = .01) pelvic area at 22 mo. All implanted heifers had higher (P = .05) occurrence of non-ovulatory estrus. No differences were found among treatments in percentage of heifers puberal before breeding, in estrus first 21 d of breeding, or in first-service conception rate. In only one trial, pregnancy first 21 d and total pregnancy in 63-d breeding season were decreased (P = .05) by implanting at 6 mo. At subsequent calving, an interaction existed between the effects of the 2- and the 6-mo implant for calf birth weight and pelvic area:birth weight ratio. A single implant at either 2 or 6 mo decreased (P = .01) calving difficulty score; and implanting at both 2 and 6 mo showed the greatest reduction in calving difficulty. Implants had no significant long-term effects on reproduction or calf production of 2-yr-old cows.(ABSTRACT TRUNCATED AT 250 WORDS)

Original languageEnglish (US)
Pages (from-to)292-299
Number of pages8
JournalJournal of animal science
Volume72
Issue number2
DOIs
StatePublished - Feb 1994

Fingerprint

Breeding
Reproduction
calving
heifers
Estrus
Birth Weight
Growth
Pregnancy
calves
birth weight
estrus
Weights and Measures
pregnancy
Therapeutics
breeding
conception rate
progesterone drug combination estradiol benzoate
yearlings
long term effects
breeding season

ASJC Scopus subject areas

  • Food Science
  • Animal Science and Zoology
  • Genetics

Cite this

Effects of Synovex C implants on growth rate, pelvic area, reproduction, and calving performance of replacement heifers. / Hancock, R. F.; Deutscher, G. H.; Nielsen, M. K.; Colburn, D. J.

In: Journal of animal science, Vol. 72, No. 2, 02.1994, p. 292-299.

Research output: Contribution to journalArticle

Hancock, R. F. ; Deutscher, G. H. ; Nielsen, M. K. ; Colburn, D. J. / Effects of Synovex C implants on growth rate, pelvic area, reproduction, and calving performance of replacement heifers. In: Journal of animal science. 1994 ; Vol. 72, No. 2. pp. 292-299.
@article{9b0b2af0d0284653a6ff8dfd7f620545,
title = "Effects of Synovex C implants on growth rate, pelvic area, reproduction, and calving performance of replacement heifers.",
abstract = "Two trials were conducted to evaluate effects of Synovex C implants on replacement heifers, given at two different ages. Crossbred heifer calves (n = 370) were allotted to four treatments: 1) nonimplanted controls, 2) implanted at 2 mo, 3) implanted at 6 mo, and 4) implanted at both 2 and 6 mo of age. Heifers implanted at 2 mo gained 7 kg more (P = .01) by 6 mo than those not implanted at 2 mo. No differences were found in 22-mo weights. All implanted heifers had larger (P = .01) yearling pelvic area than controls. All heifers implanted at 6 mo continued to have larger (P = .01) pelvic area at 22 mo. All implanted heifers had higher (P = .05) occurrence of non-ovulatory estrus. No differences were found among treatments in percentage of heifers puberal before breeding, in estrus first 21 d of breeding, or in first-service conception rate. In only one trial, pregnancy first 21 d and total pregnancy in 63-d breeding season were decreased (P = .05) by implanting at 6 mo. At subsequent calving, an interaction existed between the effects of the 2- and the 6-mo implant for calf birth weight and pelvic area:birth weight ratio. A single implant at either 2 or 6 mo decreased (P = .01) calving difficulty score; and implanting at both 2 and 6 mo showed the greatest reduction in calving difficulty. Implants had no significant long-term effects on reproduction or calf production of 2-yr-old cows.(ABSTRACT TRUNCATED AT 250 WORDS)",
author = "Hancock, {R. F.} and Deutscher, {G. H.} and Nielsen, {M. K.} and Colburn, {D. J.}",
year = "1994",
month = "2",
doi = "10.2527/1994.722292x",
language = "English (US)",
volume = "72",
pages = "292--299",
journal = "Journal of Animal Science",
issn = "0021-8812",
publisher = "American Society of Animal Science",
number = "2",

}

TY - JOUR

T1 - Effects of Synovex C implants on growth rate, pelvic area, reproduction, and calving performance of replacement heifers.

AU - Hancock, R. F.

AU - Deutscher, G. H.

AU - Nielsen, M. K.

AU - Colburn, D. J.

PY - 1994/2

Y1 - 1994/2

N2 - Two trials were conducted to evaluate effects of Synovex C implants on replacement heifers, given at two different ages. Crossbred heifer calves (n = 370) were allotted to four treatments: 1) nonimplanted controls, 2) implanted at 2 mo, 3) implanted at 6 mo, and 4) implanted at both 2 and 6 mo of age. Heifers implanted at 2 mo gained 7 kg more (P = .01) by 6 mo than those not implanted at 2 mo. No differences were found in 22-mo weights. All implanted heifers had larger (P = .01) yearling pelvic area than controls. All heifers implanted at 6 mo continued to have larger (P = .01) pelvic area at 22 mo. All implanted heifers had higher (P = .05) occurrence of non-ovulatory estrus. No differences were found among treatments in percentage of heifers puberal before breeding, in estrus first 21 d of breeding, or in first-service conception rate. In only one trial, pregnancy first 21 d and total pregnancy in 63-d breeding season were decreased (P = .05) by implanting at 6 mo. At subsequent calving, an interaction existed between the effects of the 2- and the 6-mo implant for calf birth weight and pelvic area:birth weight ratio. A single implant at either 2 or 6 mo decreased (P = .01) calving difficulty score; and implanting at both 2 and 6 mo showed the greatest reduction in calving difficulty. Implants had no significant long-term effects on reproduction or calf production of 2-yr-old cows.(ABSTRACT TRUNCATED AT 250 WORDS)

AB - Two trials were conducted to evaluate effects of Synovex C implants on replacement heifers, given at two different ages. Crossbred heifer calves (n = 370) were allotted to four treatments: 1) nonimplanted controls, 2) implanted at 2 mo, 3) implanted at 6 mo, and 4) implanted at both 2 and 6 mo of age. Heifers implanted at 2 mo gained 7 kg more (P = .01) by 6 mo than those not implanted at 2 mo. No differences were found in 22-mo weights. All implanted heifers had larger (P = .01) yearling pelvic area than controls. All heifers implanted at 6 mo continued to have larger (P = .01) pelvic area at 22 mo. All implanted heifers had higher (P = .05) occurrence of non-ovulatory estrus. No differences were found among treatments in percentage of heifers puberal before breeding, in estrus first 21 d of breeding, or in first-service conception rate. In only one trial, pregnancy first 21 d and total pregnancy in 63-d breeding season were decreased (P = .05) by implanting at 6 mo. At subsequent calving, an interaction existed between the effects of the 2- and the 6-mo implant for calf birth weight and pelvic area:birth weight ratio. A single implant at either 2 or 6 mo decreased (P = .01) calving difficulty score; and implanting at both 2 and 6 mo showed the greatest reduction in calving difficulty. Implants had no significant long-term effects on reproduction or calf production of 2-yr-old cows.(ABSTRACT TRUNCATED AT 250 WORDS)

UR - http://www.scopus.com/inward/record.url?scp=0028373753&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0028373753&partnerID=8YFLogxK

U2 - 10.2527/1994.722292x

DO - 10.2527/1994.722292x

M3 - Article

C2 - 8157513

AN - SCOPUS:0028373753

VL - 72

SP - 292

EP - 299

JO - Journal of Animal Science

JF - Journal of Animal Science

SN - 0021-8812

IS - 2

ER -