Differences in Feeding and Management Associated With Milk Yields in Ontario Dairy Herds

Fredeen, A. H.; Macleod, G.K.; Grieve, D.G.; McMillan, I.; Wilson, G. F.

doi:10.4141/cjas82-052

Cited by 3 publications

(4 citation statements)

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“…Mean feed efficiency (Table 1) was similar to results from experimental (Hooven et al 1972) and field (Fredeen et al 1982) studies. Fredeen et al (1982) weighed feed and refusals at herd visits for 56 herds in Ontario and determined gross feed efficiency from daily energy intake (Mcal NEL/day) and 4% FCM for low-, medium-, and high-producing herds.…”

Section: Means and Standard Deviationssupporting

confidence: 74%

“…Feed efficiency (FCM/total energy intake) ranged from 0.66 kg Mcal -1 NEL for low-producing herds to 0.74 kg Mcal -1 NEL for high-producing herds. The similarity of mean feed efficiency calculated from the DHAS data with the more objective measurements by Fredeen et al (1982) supports the DHAS system of energy intake estimation. Before drawing conclusions, however, it should be noted that, although average group intake may be similar, individual DHAS intake records are subject to a larger degree of estimation error, because of the method of energy intake estimation, as described in Moore et al (1991).…”

Section: Means and Standard Deviationssupporting

confidence: 59%

“…with the majority of literature estimates (Fredeen et al 1982;Thompson et al 1983;Korver et al 1991;Moore et al 1991). Phenotypically and genetically higher-producing cows consumed more grain and total energy.…”

Section: Production Traitsmentioning

confidence: 98%

“…Fredeen et al (1982) weighed feed and refusals at herd visits for 56 herds in Ontario and determined gross feed efficiency from daily energy intake (Mcal NEL/day) and 4% FCM for low-, medium-, and high-producing herds. Feed efficiency (FCM/total energy intake) ranged from 0.66 kg Mcal -1 NEL for low-producing herds to 0.74 kg Mcal -1 NEL for high-producing herds.…”

Section: Means and Standard Deviationsmentioning

confidence: 99%

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Genetic and phenotypic parameter estimates between production, feed intake, feed efficiency, body weight and linear type traits in first lactation Holsteins

Kennedy¹,

Dekkers²,

Moore³

et al. 1999

Can. J. Anim. Sci.

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L. 1999. Genetic and phenotypic parameter estimates between production, feed intake, feed efficiency, body weight and linear type traits in first lactation Holsteins. Can. J. Anim. Sci. 79: 425-431. Production and feed intake data on 36 115 first lactation Holstein cows obtained from Quebec Dairy Herd Analysis Service were combined with conformation data from the Holstein Association of Canada to estimate genetic correlations among production, energy intake, and conformation traits. Traits considered were 305-d milk yield, 305-d grain energy and total energy intake, feed efficiency (fat corrected milk yield/total energy intake), body weight at calving, capacity, size, stature, rump width and final score. Genetic and phenotypic parameters were estimated using Restricted Maximum Likelihood based on two-trait animal mixed model analyses. The model contained fixed effects of herd-year, season of calving, age of calving, sire group and a random animal genetic effect. Estimates of heritability were within the published range for all traits. Of the conformation traits examined, capacity, size and stature had the highest correlations with body weight, with phenotypic correlations between 0.36 and 0.43, and genetic correlations between 0.61 and 0.79. Feed efficiency was negatively correlated to all body size measures, both phenotypically (-0.01 to -0.29) and genetically (-0.31 to -0.53), but most significantly with body weight, capacity, size, and stature. Fat-corrected milk yield showed negligible phenotypic and low to moderately negative genetic (-0.07 to -0.29) correlations with body weight and related type traits. Total energy intake was positively related to all measures of body size, most notably body weight, while grain energy intake had moderately negative genetic correlations (-0.20 to -0.40) with the same body size traits. Because of their detrimental relationships with feed efficiency, negative selection emphasis should be placed on body weight and the related type traits capacity, size and stature. Capacity, size and stature are of moderate utility when selecting indirectly for body weight, total energy intake and feed efficiency.Key words: Dairy cattle, genetics, production, conformation, feed efficiency Parke, P., Jr., Kennedy, B. W., Dekkers, J. C. M., Moore, R. K. et Jairath, L. 1999. Calculs des rapports génétiques et phéno-typiques entre la production, l'ingéré alimentaire, l'indice de consommation, le poids corporel et les caractères de conformation chez des vaches Holstein primipares. Can. J. Anim. Sci. 79: 425-431. Nous avons combiné à des données sur la conformation fournies par l'Association Holstein du Canada les relevés de production et de consommation fourragère obtenus du PATLQ sur 36 115 vaches Holstein primipares. L'objet était de calculer les corrélations génétiques entre les caractères de production d'ingestion alimentaire et de conformation. Les paramètres considérés étaient le rendement laitier, l'ingéré énergétique total et l'ingéré d'énergie céréalière à 305 j, l'indice de conversion (...

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Section: Means and Standard Deviationssupporting

confidence: 74%

Section: Means and Standard Deviationssupporting

confidence: 59%