Effect of high-protein supplements on the utilization of body reserves by single-suckling cows

Chestnutt, D. M. B.

doi:10.1017/s0003356100036564

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…Secondly, in situations of lipomobilisation, the intracellular fat is partially substituted by water (Ferrell and Jenkins, 1984;Robinson, 1986;Chestnutt, 1987) and fat is predominantly used for the mobilisation of body energy (Gibb et al, 1992). Thirdly, several authors noticed that cows in negative energy balance can realise a protein retention (Tamminga et al, 1997;Sutter and Beever, 2000) combined with a water retention at a ratio of 1 : 3.4 (Tamminga et al, 1997).…”

Section: Discussionmentioning

confidence: 99%

Analysis of feed intake and energy balance of high-yielding first lactating Holstein cows with fixed and random regression models

Hüttmann

Stamer²,

Junge

et al. 2009

Animal

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At the dairy research farm Karkendamm, the individual roughage intake was measured since 1 September 2005 using a computerised scale system to estimate daily energy balances as the difference between energy intake and calculated energy requirements for lactation and maintenance. Data of 289 heifers with observations between the 11th and 180th day of lactation over a period of 487 days were analysed. Average energy-corrected milk yield, feed intake, live weight and energy balance were 31.8 kg, 20.6 kg, 584 kg and 13.6 MJ NEL (net energy lactation), respectively, per day. Fixed and random regression models were used to estimate repeatabilities, correlations between cow effects and genetic parameters. The resulting genetic correlations in different lactation stages demonstrate that feed intake and energy balance at the beginning and the middle of lactation are genetically different traits. Heritability of feed intake is low with h 2 50.06 during the first days after parturition and increases in the middle of lactation, whereas the energy balance shows the highest heritability with h 2 50.34 in the first 30 days of lactation. Genetic correlations between energy balance and feed intake and milk yield, respectively, illustrate that energy balance depends more on feed intake than on milk yield. Genetic correlation between body condition score and energy balance decreases rapidly within the first 100 days of lactation. Hence, to avoid negative effects on health and reproduction as consequences of strong energy deficits at the beginning of lactation, the energy balance itself should be measured and used as a selection criterion in this lactation stage. Since the number of animals is rather small for a genetic analysis, the genetic parameters have to be evaluated on a more comprehensive dataset.

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