Live Weight of Cow at Various Stages of Lactation in Relation to Milk-Energy Yield

Gaines, W.L.

doi:10.3168/jds.s0022-0302(41)95458-9

Cited by 13 publications

(5 citation statements)

References 4 publications

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“…The data in Table 1 cast an interesting light on the relationship of size or weight with milk yield. Gaines (1941) and Davis, Morgan & Gaines (1943) were the first to draw attention to the effect of the stage of lactation upon the relationship between body weight and milk yield. They showed that the relationship was closest between lactation yield and the weight recorded in the first month of lactation and that it diminished progressively with the stage of lactation at which weight was recorded.…”

Section: Efficiency Of Utilization Of Me Formentioning

confidence: 99%

“…One point of importance is the value of the exponent of weight to be used in relation to maintenance. Since the general acceptance of an exponent of about 0-75 (see Brody, 1945) for interspecies comparisons, estimates made with small numbers have been very variable-see Gaines (1941) and Davis et al (1943). This is not surprising in view of the variation that exists in the main relationship between FCM and live weight (Table 1).…”

Section: Efficiency Of Utilization Of Me Formentioning

confidence: 99%

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A study of factors affecting the efficiency of feed conversion in Red Danish heifers

Owen

Nielsen

1968

J. Agric. Sci.

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Data from 692 daughters of 38 Red Danish bulls, tested as heifers in the Danish cattle progeny testing stations 1963-64, were analysed to provide information on the efficiency of feed utilization by dairy cows. The results showed that because of, the feeding system adopted, efficiency measured as FCM per food unit was automatically closely related to FCM yield.Analysis based on pooled, within-bull, values showed that (a) both efficiency and FCM were negatively associated with body-weight gain during lactation, suggesting that feed allowances per unit FCM were low in relation to those for maintenance, (6) weight measured after calving was positively associated with efficiency and FCM yield whereas the association of these latter variables with weight at the end of the winter period was negative, and (c) the gain in weight during lactation was much lower in cows heavy at calving and higher in those heavy at the end of the winter.The between-bull correlations, although less reliable than the within-bull values, clearly indicated that the selection for FCM yield would result in increased cow weight.It is suggested that the selection of dairy cattle should not be based solely on milk yield but that suitable adjustments should be made so that selection for efficiency is safeguarded. Quantitative assessment of such adjustments would necessitate changing feeding procedures at central testing stations.Considerable research has been done on the total diet is not individually rationed. A further development of sound methods for the genetic possible trend is the development of completely improvement of dairy cows. In the methods so far ad libitum systems of feeding dairy cows (Owen, developed (see Johansson, 1962) almost all the Miller & Bridge, 1967). These trends necessitate the selection pressure is placed on the output (both re-evaluation of the factors affecting the efficiency quantity and quality) of milk by the cow. Individual of feed use by the dairy cow especially with regard milk yield per se, however, is not the main determi-to factors other than milk yield, nant of the profitability of dairy enterprises; it Unfortunately data on the ad libitum feeding of merely spreads overheads, associated with the cow dairy cows are rather limited. The most extensive as a unit, over more milk. A decision to concentrate data available under a conventional feeding system, on yield per cow thus rests upon the assumption where records of both input and output exist, that milk yield is very closely related to feed con-relates to heifers tested at the Danish cattle progeny version efficiency. Mason, Robertson & Gjelstad testing stations. These data which include full (1957) showed that where cows are fed according to records of food intake for the winter period have conventional feeding standards a close relationship been analysed to study the factors influencing of this kind between yield and efficiency is an efficiency in the cow. The data also provide an inevitable consequence. Their analysis of data from opportunity to estimate...

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Section: Efficiency Of Utilization Of Me Formentioning

confidence: 99%

Section: Efficiency Of Utilization Of Me Formentioning

confidence: 99%

A study of factors affecting the efficiency of feed conversion in Red Danish heifers

Owen

Nielsen

1968

J. Agric. Sci.

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“…Milk recording began 4 days after the date of calving. Although the lactation length was not used by Games (1,2,6), it was included here in order to afford a statistical control of error. The lactation yield of 4 % fat-corrected milk was calculated from the lactation yield of milk and the lactation yield of milk fat estimated from the monthly tests of fat percentage (see (4) for details of the test technique).…”

Section: Methodsmentioning

confidence: 99%

531. The influence of live weight on milk production during the first lactation

Bailey

Broster

1954

Journal of Dairy Research

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The relationship between live weight and lactation production was examined; records from ninety-nine animals, daughters of seven bulls, were used.A positive relationship was found to exist within each of the seven groups and within the entire population.The relationship did not exist between the mean values of the group.No correlation was found between the live weights at calving of forty-seven dam/daughter pairs; the daughters were the offspring of six bulls.It was shown that a herd breeding policy which selected animals according to their size would fail, except by chance, to improve the production of the herd.

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“…In 1941 Gaines (262) claimed that within a dairy breed and within a herd the yield of fatcorrected milk produced by a cow is proportional to the 1-07 power of its live weight, where the live weight is determined in the first month of lactation, and he concluded that it would be sound practice to express lactation performance in terms of milk-energy yield for the first 8 months of lactation divided by the live weight in the first month of lactation, FCM^W^. This claim has been disputed by Kleiber & Mead (263) on the grounds that Gaines's data and conclusion were statistically unreliable, that age corrections may be hidden corrections for body weight, since cows continue to grow after their first lactation, and that size differences within a herd are so small.…”

Section: Anatomical and Belated Aspectsmentioning

confidence: 97%

Section A. Physiology of dairy cattle. I. Reproduction and lactation

Smith

1950

Journal of Dairy Research

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Live Weight of Cow at Various Stages of Lactation in Relation to Milk-Energy Yield

Cited by 13 publications

References 4 publications

A study of factors affecting the efficiency of feed conversion in Red Danish heifers

A study of factors affecting the efficiency of feed conversion in Red Danish heifers

531. The influence of live weight on milk production during the first lactation

Section A. Physiology of dairy cattle. I. Reproduction and lactation

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