Relationships among Factors Associated with Mothering Ability in Beef Cattle

Drewry, K. J.; Brown, C. J.; Honea, R. S.

doi:10.2527/jas1959.183938x

Cited by 54 publications

(33 citation statements)

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“…Cowage has been found to have a significant effect on milk production (Williams et aI., 1979a;Jeffery et aI., 1971 a;Rutledge et aI., 1970a;Christian et aI., 1965;Drewry et al,. 1959;Reynolds et aI., 1978;Nelms et aI., 1978;Melton et aI., 1967a;Neville, Jr., et aI., 1974;Todd et aI., 1969).…”

Section: Cowage and Milk Production Calf Gain And Weaning Weightunclassified

“…In a study of Angus cows, Drewry et al (1959) reported that 12.5 kg, 10.8 kg and 6.3 kg of milk were required to produce one kg of calf gain in the first, third and sixth month respectively. Using crossbred cows, Butson and Berg (1984a) found that a .1 kg increase in average daily gain was associated with a .480 kg and a .211 kg increase I June and September milk production, respectively.…”

Section: Milk Production and Calf Gainmentioning

confidence: 99%

“…Calves from the higher milking cows came back to the average somewhat . Drewry et al (1959) studied suckling time and found a correlation between suckling time and total gain of -.2868 (P < .05). Calves suckled longer and harder on lower producing cows (Drewry et al.…”

Section: Calf Milk Consumption and Forage Intakementioning

confidence: 99%

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Milk production of crossbred daughters of high- and low-milk EPD Angus and Hereford bulls.

Minick

Buchanan

Rupert

2001

Journal of Animal Science

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Section: Cowage and Milk Production Calf Gain And Weaning Weightunclassified

Section: Milk Production and Calf Gainmentioning

confidence: 99%

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Milk production of crossbred daughters of high- and low-milk EPD Angus and Hereford bulls.

Minick

Buchanan

Rupert

2001

Journal of Animal Science

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“…Sire variances for preweaning gain estimated by Kennedy (1974) The work of Frisch (1981) in Australia and Bertrand et al (1985) The maternal component of preweaning gain is expected to be due primarily to milk yield (Drewry et al 1959) but may also be affected by maternal behavior (Baker 1980 Direct heritability (Table 3) was reasonably high for most breeds. Charolais and Hereford had the lowest estimates suggesting less genetic progress will be made for preweaning gain if selection is based solely on the direct effect.…”

Section: Preweaning Gainmentioning

confidence: 99%

Genetic Parameters for Maternal Traits in Beef Cattle

Trus¹,

Wilton²

1988

Can. J. Anim. Sci.

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Direct (D) and maternal (M) parameters for birth weight (BW), preweaning gain (WG) and calving ease (CE) were estimated for Angus (AN), Hereford (HE), Charolais (CH), Simmental (SM) and Shorthorn (SS). Data for the study were collected by Agriculture Canada from 1973 to 1983 for use in the National Sire Monitoring Program. Variances were estimated for each breed by a modified Method IV applied to a sire-maternal grandsire model with herd-year-seasons and age of dam × sex of calf as fixed effects. Genetic correlations (D/M) between D and M effects for WG in AN, HE, SS, CH and SM were −0.54, −0.42, −0.14, −0.26 and −0.45, respectively. Corresponding estimates of direct heritability for WG were 0.39, 0.30, 0.39, 0.27 and 0.43 and of maternal heritability 0.21, 0.27, 0.26, 0.16 and 0.20. Estimates for BW were similar to those for WG. Estimates of the D/M correlation for CE were −0.43, −0.15, −0.32, −0.74 and −0.27, of the direct heritability 0.28, 0.17, 0.19, 0.33 and 0.21, and of the maternal heritability 0.22, 0.13, 0.19, 0.23 and 0.27 for AN, HE, SS, CH and SM, respectively. Genetic trend and the introduction of new genetic lines are expected to have influenced parameter estimates. Due to negative D/M correlation estimates and moderate maternal heritabilities, selection for both the D and M components of maternal traits is advised. Key words: Variance, direct, maternal, heritability, genetic correlation, beef cattle

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“…Estimates from 6 to 24 kg are observed in the literature (Drewry et al, 1959;Neville, 1962;Jeffery et al, 1971; Le Neindre et al, 1976 Furthermore, we define c, the total number of traits; n, the number of records per trait and generation; N, the total number of records per trait (N = 2n); p, the number of bulls evaluated as sire and MGS; m, the number of records per bull (n = pm); d, the number of records per couple sire-MGS (m = dp); X, the incidence matrix of fixed effects; Z, the incidence matrix of genetic effects; R, the residual variance-covariance matrix; G, the genetic variance-covariance matrix; and V, the phenotypic variance-covariance matrix.…”

mentioning

confidence: 67%