scholarly journals Genetic variation in the feeding value of alfalfa genotypes evaluated from experiments with dairy cows

Agronomie ◽  
1997 ◽  
Vol 17 (2) ◽  
pp. 119-125 ◽  
Author(s):  
J. C. Émile ◽  
M. Mauries ◽  
G. Allard ◽  
P. Guy
Keyword(s):  
Genetic Variation ◽  
Dairy Cows ◽  
Feeding Value

Estimating the heritability of butterfat production

1961 ◽  
Vol 57 (3) ◽  
pp. 289-294 ◽  
Author(s):  
S. R. Searle
Keyword(s):  
Genetic Variation ◽  
New Zealand ◽  
Dairy Cows ◽  
Total Variance ◽  
Additive Effects ◽  
Narrow Sense ◽  
Sampling Errors ◽  
Gene Effects ◽  
Additive Gene Effects ◽  
Additive Gene

Part of the variation among butterfat yields in dairy cows arises from genetic differences among the animals. The proportion which this bears to the total variance is known as heritability. In the ‘narrow’ sense it is defined (Lush, 1940), as the proportion of the total variance that is due to additive gene effects; the ‘broad’ sense definition includes genetic variation arising from non-additive gene effects as well as that due to additive effects. Since related animals have a proportion of their genes in common the covariance among their production records can be used for estimating genetic variation and hence heritability. This paper discusses three groups of related animals most frequently used for this purpose, twins, daughter-dam pairs and paternal half-sibs, and presents the results of analysing production records of artificially bred heifers in New Zealand, including evidence of the magnitude of the sampling errors of the heritability estimates.

The preservation of a Nandi Setaria silage and its feeding value for dairy cows

1978 ◽  
Vol 18 (90) ◽  
pp. 16 ◽  
Author(s):  
RI Hamilton ◽  
VR Catchpole ◽  
LJ Lambourne ◽  
JD Korr
Keyword(s):  
Dairy Cows ◽  
Milk Production ◽  
Nutritive Value ◽  
Soluble Carbohydrates ◽  
Protein Supplement ◽  
Total N ◽  
Structural Rigidity ◽  
Energy Plus ◽  
Feeding Value ◽  
Sorghum Grain

The process of vacuum ensilage of Setaria Sphacelata (cv. Nandi) (33 per cent DM ; 7 per cent soluble carbohydrates; 1.36 per cent M) was studied, and the resultant silage was evaluated chemically, in milk production trials with dairy cows and in digestion trials with dry cows. The silage was well preserved in a chemical sense (pH 4.5; lactic acid 1.7 per cent, volatile acids 1.2 per cent DM ; volatile bases 9.8 per cent total N) but, because of the structural rigidity of the harvested grass, air could not be completely excluded even from the polythene-covered vacuum stack. The temperature reached 43�C in the first week of storage and considerable surface wastage occurred. The silage (DM digestibility 42 per cent, voluntary DM intake 81 g/kg0.75) was of poorer quality than the grass harvested (DM digestibility 54 per cent, voluntary DM intake 84 g/kg0.75) and, even by feeding concentrates, only a low level of milk production could be sustained in (mainly Jersey) cows in the 5th-9th months of lactation. In silage-fed cows given a protein supplement (cottonseed meal) milk production was lower (3.8 kg day-1) but fat content higher (5.4 per cent) than in those given an energy supplement (sorghum grain) or energy plus protein (4.7 kg day-1 and 4.9 per cent fat). When fed lucerne hay and given the same energy plus protein supplement, cows gave significantly more milk (5.7 kg day-1 and 4.6 per cent fat). The poor nutritive value of the silage is attributed to the nature and composition of the material ensiled rather than to any defect in the ensilage process itself, and may be a feature of most silage made from tropical grasses.

Whole crop barley as a supplementary feed for grazing dairy cows

1992 ◽  
Vol 1992 ◽  
pp. 64-64 ◽  
Author(s):  
A. Hargreaves ◽  
J.D. Leaver
Keyword(s):  
Dairy Cows ◽  
Animal Studies ◽  
Winter Barley ◽  
Optimum Time ◽  
Late Season ◽  
Stages Of Growth ◽  
Feeding Value ◽  
Three Stages ◽  
Grazing Dairy Cows ◽  
Supplementary Feed

It is not clear when the optimum time of harvesting the winter barley as whole crop for silage should be in terms of feeding value for dairy cows and yield of the crop. Little information is available using whole crop barley as a buffer feed. The aim of these experiments was to evaluate the feeding value of whole crop barley (WCB) silage harvested at three stages of growth as a supplementary feed for grazing dairy cows during the late season.Winter barley (var. Pipkin) was harvested at 4 stages of growth : T1:250, T2:350, T3:450 and T4:550 gDM/kg, at the following dates : 25/5, 19/6, 3/7 and 11/7/1991, respectively. The chopped material from T1-T4 was stored in minisilos and from T1-T3 in larger silos for animal studies.

scholarly journals Fine-mapping host genetic variation underlying outcomes to Mycobacterium bovis infection in dairy cows

BMC Genomics ◽  
2017 ◽  
Vol 18 (1) ◽  
Author(s):  
S. Wilkinson ◽  
S.C. Bishop ◽  
A.R. Allen ◽  
S.H. McBride ◽  
R.A. Skuce ◽  
...  
Keyword(s):  
Genetic Variation ◽  
Dairy Cows ◽  
Mycobacterium Bovis ◽  
Fine Mapping ◽  
Host Genetic

scholarly journals The Feeding Value of Grass Silage in the Ration for Dairy Cows

1941 ◽  
Vol 24 (7) ◽  
pp. 549-560 ◽  
Author(s):  
O.L. Lepard ◽  
E.S. Savage
Keyword(s):  
Dairy Cows ◽  
Grass Silage ◽  
Feeding Value

scholarly journals Feeding Value of Calcium Carbonate–Treated Corn Silage for Dairy Cows

1965 ◽  
Vol 48 (10) ◽  
pp. 1315-1318 ◽  
Author(s):  
K.L. Simkins ◽  
B.R. Baumgardt ◽  
R.P. Niedermeier
Keyword(s):  
Calcium Carbonate ◽  
Dairy Cows ◽  
Corn Silage ◽  
Feeding Value
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