Puberty in Crossbred and Straightbred Beef Heifers on two Levels of Feed

Wiltbank, J. N.; Kasson, C. W.; Ingalls, J. E.

doi:10.2527/jas1969.294602x

Cited by 109 publications

(52 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Sawyer et al (1991) observaram que novilhas com VPA nas faixas de -0,600 a -0,100, de -0,100 a 0,100 e 0,100 a 0,600 kg dia -1 durante a estação de monta, apresentaram 43%, 55% e 70% de TP, respectivamente. Esta relação apresentada por Sawyer et al (1991) também é evidenciada em fê-meas adultas (Wiltbank et al, 1969). A tendência de maior TP em fêmeas da categoria III (Tabela 5) se deve ao maior GD60 destas, que provavelmente proporcionou um efeito de flushing, permitindo maior desenvolvimento das estruturas ovarianas (Mourasse et al, 1985), conforme se observa à tendência de maior ETR (P>0,05) nas fêmeas da categoria III, mas que vinham de maiores GD60.…”

Section: Resultsunclassified

See 1 more Smart Citation

Ganho de peso na recria e desempenho reprodutivo de novilhas acasaladas com sobreano

Montanholi

Barcellos

Borges

et al. 2004

Pesq. agropec. bras.

View full text Add to dashboard Cite

O objetivo deste trabalho foi avaliar os efeitos da intensidade do ganho de peso no período de recria, dos 13 aos 18 meses de idade, sobre a taxa de prenhez de novilhas de corte acasaladas com o sobreano durante o outono. Os tratamentos foram constituídos de 30 novilhas com peso médio de 208 kg, submetidas a ganho médio de 0,595 kg dia-1 (G600), 41 novilhas com peso médio de 197 kg submetidas a ganho médio de 0,656 kg dia-1 (G700) e 58 novilhas com peso médio de 181 kg submetidas a ganho médio de 0,723 kg dia-1 (G800). Foram avaliados os efeitos dos tratamentos sobre peso, escore de trato reprodutivo e taxa de prenhez. As taxas de prenhez foram 30,0% 47,8% e 50,0% para os grupos G600, G700 e G800, respectivamente, não existindo diferença significativa entre os grupos. Os grupos G700 e G800, submetidos à maior taxa de ganho de peso, apresentaram maiores valores de escore de trato reprodutivo em relação ao G600 no início da estação de monta. Novilhas com escores mais elevados apresentaram tendência a maior taxa de prenhez. A taxa de prenhez esteve associada à intensidade de ganho de peso na recria independentemente das variações de peso no acasalamento.

show abstract

Section: Resultsunclassified

“…Associado a este fator, existem os efeitos da intensidade do ganho de peso (Wiltbank et al, 1969) e da fase pós-desmame, quando ocorre esse ganho (Dufour, 1975). Do ponto de vista biológico, deve-se salientar que a puberdade não é determinada pelo peso, mas por uma série de condições fisiológicas que resultam em um determinado peso.…”

Section: Introductionunclassified

Ganho de peso na recria e desempenho reprodutivo de novilhas acasaladas com sobreano

Montanholi

Barcellos

Borges

et al. 2004

Pesq. agropec. bras.

View full text Add to dashboard Cite

show abstract

“…In conclusion it should be noted that age at puberty varied less among the breedcrosses in this study than other researchers (Wiltbank et al 1969;Short and Bellows 1971) For personal use only.…”

mentioning

confidence: 49%

Age and Weight at Puberty of Crossbred Heifers Sired by Charolais, Limousin, and Simmental Bulls

Swierstra¹,

Rahnefeld²,

Cliplef³

et al. 1977

Can. J. Anim. Sci.

View full text Add to dashboard Cite

and 292 kg, respectively). Heifers from Angus and Hereford dams were aboul 22 days older (P < 0.01) at puberty than heifers from Shorthorn dams (median 347 and 346 vs. 324 days). Heifers with high preweaning grqwth rates attained puberty at an earlier age 1r : *0.24; P < 0.01). Day of birth within the year had a significant effect on age and weight at puberty; i.e., heifers bom early in the calving season were older and heavier at puberty. Weight at puberty was associated with weaning weight (r : 0.61;P < 0.01), birth weight (r : O.4l; P < 0.01), and preweaning average daily gain (r : 0.54;P < 0.01). Calves that were heavy at birth tended to be heavy at weaning, and heavy weaning weights, in turn, were associated with heavy weights at puberty. By l5 mo of age,997a of all heifers were cycling.

show abstract

“…Heifers conieive earty 1t+-tS mo; Wiltbank et al 1969) in their first conceiving early in their first breeding season typically continue breeding season and calve early in the calving season as twoto calve early, and thus wean heavier calves throughout their year-olds has a major impact on lifetime cow productivity productive lives (rsmeister et al 1973;Marshall et al 1990 Byerley et al 1987). Growth implants have been shown to enhance rate of gain (Lemieux et al 1988;Woods et al 1990) and, as such, producers may benefit from using a growth promotant in their heifer calves to obtain a puberal target weight before the start of the first breeding season.…”

mentioning

confidence: 99%

“…Proper management of replacement heifers such that they (Wiltbank et al 1969;Irsmeister et al 1973). Heifers conieive earty 1t+-tS mo; Wiltbank et al 1969) in their first conceiving early in their first breeding season typically continue breeding season and calve early in the calving season as twoto calve early, and thus wean heavier calves throughout their year-olds has a major impact on lifetime cow productivity productive lives (rsmeister et al 1973;Marshall et al 1990 Byerley et al 1987).…”

mentioning

confidence: 99%

Effects of a growth implant and age of dam on growth and fertility in heifer calves

Rutter¹,

Day²

1994

Can. J. Anim. Sci.

View full text Add to dashboard Cite

Rutter, L. M. and Day, P. A. 1994. Effects of a growth implant and age of dam on growth and fertility in heifer calves.Can. J. Anim. . A field trial was conducted to determine the effects of a growth implant on growth, pregnancy rate, calving difficulty and calf weaning weight in replacement beef heifers. Heifers were assigned equally to either a control (n : 43; no implant! Ralgro (n : +:l or Synovex-C (n : 42) LeJ dimensions pelviennes 6taient iemblables d'un traitement i I'autre lors du diagnostic de gravidit6 et on n'observait pas non plus de diff6ren6e quant i la facilit6 de vOlage. L'Age de la mbre influait sur le poids (P = 0,0005), sur le GMQ (P : 0'001) de la g6nisse jusqu;au sevrage, les g6nisses n6es de mdres plus dg6es pesant davantage au sevrage et affichant un GMQ plus 6lev6 que les gdnisses n6es de mdres de premier ou de second v0lage. La performance post-sevrage des g6nisses ndes de mbres primipares 6tait semblable ir celle des g6nisses n6es de mbres plus dg6es, tandis que les g6nisses n6es de mdres de deuxibme vQlage pesaient moins ir la mise d la reproduction (P = 0,04) et montraient un GMQ moindre du sevrage d la mise ir la reproduction (P : 0,04). L'dge de la mdre n'avait pas d'incidence sur le taux de gravidit6 (P : 0,10), mais plus de fil1es de mdres de seconc vOlage vOlaient plus tard dans la saison (= 64 j) que celles de mdres primipares au plus dg6es (P : 0,04

show abstract

Puberty in Crossbred and Straightbred Beef Heifers on two Levels of Feed

Cited by 109 publications

References 0 publications

Ganho de peso na recria e desempenho reprodutivo de novilhas acasaladas com sobreano

Ganho de peso na recria e desempenho reprodutivo de novilhas acasaladas com sobreano

Age and Weight at Puberty of Crossbred Heifers Sired by Charolais, Limousin, and Simmental Bulls

Effects of a growth implant and age of dam on growth and fertility in heifer calves

Contact Info

Product

Resources

About