Correlation of blood and milk components with the milk yield response to bovine somatotropin in dairy cows

2005 ◽  
Vol 28 (3) ◽  
pp. 296-307 ◽  
Author(s):  
M.T. Rose ◽  
T.E.C. Weekes ◽  
P. Rowlinson
Keyword(s):  
Dairy Cows ◽  
Milk Yield ◽  
Bovine Somatotropin ◽  
Yield Response ◽  
Milk Components

Variation in the milk yield, endocrine and metabolic responses following bovine somatotropin administration to dairy cows

1992 ◽  
Vol 1992 ◽  
pp. 36-36
Author(s):  
M.T. Rose ◽  
T.E.C. Weekes ◽  
P. Rowlinson
Keyword(s):  
Dairy Cows ◽  
Milk Yield ◽  
Subcutaneous Administration ◽  
Bovine Somatotropin ◽  
Yield Response ◽  
Term Study ◽  
Long Term Study ◽  
Genetic Potential ◽  
Long Term Studies

It is well established that the subcutaneous administration of bovine somatotropin (bst) to dairy cows results in an increased level of milk production. This effect occurs irrespective of the method of application, the duration of the treatment or the time after calving after which it commences. However, the reported extent of this galactopoietic effect in the published literature has been highly variable, with one long term study reporting an increase of over 11.5 kg/day (Bauman et al. 1985), whilst other long term studies have reported relatively small increases or no significant increase at all (Hof et al. 1991, Morbeck et al. 1991). As yet it is unknown what factors control the milk yield response to bst, though there is a clear effect of dose of the hormone and possibly of energy and protein balance. There are also confusing reports on the effect of the previous milk yield and genetic potential of the animal on the observed increase.

The effect of level and type of supplement offered to grazing dairy cows on herbage intake, animal performance and rumen fermentation characteristics

2003 ◽  
Vol 76 (3) ◽  
pp. 439-454 ◽  
Author(s):  
H. J. Sayers ◽  
C. S. Mayne ◽  
C. G. Bartram
Keyword(s):  
Dairy Cows ◽  
Milk Yield ◽  
Milk Protein ◽  
Protein Composition ◽  
Experimental Period ◽  
Yield Response ◽  
Animal Performance ◽  
Two Phase ◽  
Grazed Pasture ◽  
Herbage Intake

AbstractA study was undertaken to examine the effect of level and type of supplement and changes in the chemical composition of herbage through the grazing season on herbage intake, animal performance and rumen characteristics with high-yielding dairy cows. Thirty-two high genetic merit dairy cows were allocated to one of four treatments in a two-phase change-over design experiment. The four treatments involved offering either high-fibre (HF) or high-starch (HS) supplements at either 5 or 10 kg dry matter (DM) per day. Animals rotationally grazed perennial ryegrass swards offered a daily herbage allowance of 23 kg DM. High levels of animal performance were maintained throughout the study with mean milk yields over the 21-week experimental period of 35·5 and 37·2 kg per cow per day on the 5- and 10-kg treatments respectively. Supplement type had no significant effect on herbage intake. Increasing the level of supplementation reduced herbage intake by 0·49 and 0·46 kg herbage DM per kg supplement DM and increased milk yield, with a milk yield response of 0·55 and 0·65 kg/kg supplement DM offered in phases 1 and 2. Supplement type had no significant effect on milk yield and milk butterfat content. However, in both phases 1 and 2, milk protein content was significantly higher with cows offered the HS supplement compared with the HF supplement, this being particularly evident at the higher level of supplementation. Supplement type also had marked effects on milk protein composition. These results indicate that high levels of performance can be achieved with dairy cows on grazed pasture with moderate levels of supplementation.

scholarly journals Effect of Exogenous Bovine Somatotropin on Mammary Lipid Metabolism and Milk Yield in Lactating Dairy Cows

1989 ◽  
Vol 72 (6) ◽  
pp. 1469-1476 ◽  
Author(s):  
D.S. Lough ◽  
L.D. Muller ◽  
R.S. Kensinger ◽  
L.C. Griel ◽  
C.D. Azzara
Keyword(s):  
Lipid Metabolism ◽  
Dairy Cows ◽  
Milk Yield ◽  
Bovine Somatotropin ◽  
Lactating Dairy Cows

scholarly journals Non-invasive indicators associated with the milk yield response after anthelmintic treatment at calving in dairy cows

2014 ◽  
Vol 10 (1) ◽  
Author(s):  
Sien H Verschave ◽  
Jozef Vercruysse ◽  
Andrew Forbes ◽  
Geert Opsomer ◽  
Miel Hostens ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Milk Yield ◽  
Anthelmintic Treatment ◽  
Yield Response ◽  
Non Invasive

Effects of lactation month and season on test-day milkyield and milk components in Holstein cows

2016 ◽  
Author(s):  
Ertugrul Kul ◽  
Özden Çobanoglu ◽  
Eser Kemal Gurcan ◽  
Soner Çankaya ◽  
Samet Hasan Abaci ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Protein Content ◽  
Milk Yield ◽  
Fat Content ◽  
Protein Yield ◽  
Lactation Period ◽  
Milk Components ◽  
Fat Yield ◽  
Sampling Season ◽  
Holstein Dairy Cows

This study aims to determine the correlations between the test-day milk yield (TDMY) and the fat and protein content as well as the fat and protein yields in Holstein dairy cows and to investigate the effects of lactation period and sampling season on these parameters. The study material consists of 1.380 records of a total of 151 head of Holstein dairy cows raised on a private farm in Samsun province. In the study, the mean TDMY, fat content, protein content, fat yield and protein yield were recorded as 20.6±5.10 kg, 3.97±0.734%, 3.23±0.276%, 0.81±0.210 kg and 0.66±0.160 kg, respectively. The effects of lactation period and sampling season on the TDMY, fat content, protein content, fat yield and protein yield were found statistically significant (Pis less than 0.01). Statistically significant negative correlations were determined between the TDMY and the fat and protein content, but positive and statistically significant (Pis less than 0.01) correlations between the TDMY and the fat and protein yields. In conclusion, it might be stated that the effects of lactation period and sampling season should also be taken into account to improve milk yield and milk components.

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