scholarly journals Milk production response to varying protein supply is independent of forage digestibility in dairy cows

2014 ◽  
Vol 97 (7) ◽  
pp. 4412-4422 ◽  
Author(s):  
L. Alstrup ◽  
M.R. Weisbjerg ◽  
L. Hymøller ◽  
M.K. Larsen ◽  
P. Lund ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Milk Production ◽  
Forage Digestibility ◽  
Protein Supply ◽  
Production Response

scholarly journals Sward and milk production response to early turnout of dairy cows to pasture in Finland

2003 ◽  
Vol 12 (1) ◽  
pp. 21-34 ◽  
Author(s):  
P. VIRKAJÄRVI ◽  
A. SAIRANEN ◽  
J.I. NOUSIAINEN
Keyword(s):  
Organic Matter ◽  
Dairy Cows ◽  
Milk Production ◽  
Mass Production ◽  
Grazing Management ◽  
Northern Europe ◽  
Grazing Season ◽  
Holstein Friesian ◽  
Production Response

The timing of turnout is an important factor affecting the grazing management of dairy cows. However,its consequences are not well known in the short grazing season of northern Europe. Thus, the effect of the turnout date of dairy cows to pasture on sward regrowth, herbage mass production and milk production was studied in two experiments,1)a grazing trial with 16 Holstein-Friesian dairy cows and 2)a plot trial where the treatments simulated the grazing trial.The treatments were early turnout (1 June)and normal turnout (6 June).Early turnout decreased the annual herbage mass (HM) production in the plot trial (P =0.005),but due to a higher average organic matter (OM)digestibility (P 0.05). Although early turnout had no effect on milk yields it meant easier management of pastures.;

scholarly journals Milk Production Response to Feeding Methionine Hydroxy Analog to Lactating Dairy Cows

1968 ◽  
Vol 51 (11) ◽  
pp. 1866-1868 ◽  
Author(s):  
L.C. Griel ◽  
R.A. Patton ◽  
R.D. McCarthy ◽  
P.T. Chandler
Keyword(s):  
Dairy Cows ◽  
Milk Production ◽  
Lactating Dairy Cows ◽  
Production Response

scholarly journals Somatomedin C in dairy cows related to energy and protein supply and to milk production

1988 ◽  
Vol 47 (2) ◽  
pp. 165-183 ◽  
Author(s):  
H. Ronge ◽  
J. Blum ◽  
C. Clement ◽  
F. Jans ◽  
H. Leuenberger ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Milk Production ◽  
Ketone Bodies ◽  
Dry Period ◽  
Nonesterified Fatty Acids ◽  
Somatomedin C ◽  
Catabolic State ◽  
Additional Protein ◽  
Protein Supply ◽  
Energy Balances

ABSTRACTSomatomedin C and other hormones, as well as blood metabolites, were measured during the dry period and during lactation in dairy cows, given different amounts of energy and protein, to study metabolic and endocrine adaptations. Somatomedin C, specifically measured by radioimmunoassay after separation from its binding protein, did not exhibit typical diurnal variations, in contrast to somatotropin and insulin, which increased particularly after concentrate intake. Somatomedin C markedly decreased at parturition and reached lowest values around the peak of lactation, while levels of somatotropin, nonesterified fatty acids and ketone bodies were high and those of glucose, insulin, thyroxine and triiodothyronine were low. Thereafter somatomedin C values slowly increased up to the 12th week of lactation and remained elevated. Low energy and protein balances were characterized by particularly low somatomedin C concentrations. An additional protein deficit at peak lactation, when cows were already provided with low amounts of energy, did not further decrease somatomedin C levels. However, when high amounts of energy were given in the form of starch or crystalline fat, somatomedin C increased. Overall, there was a positive correlation of somatomedin C primarily with energy, but also with protein balances and a negative correlation with milk yield. Conversely, somatotropin increased markedly after parturition and was positively correlated with milk production and negatively with protein and energy balances. Thus, somatomedin C levels were paradoxically low in the presence of high circulating somatotropin. Insulin most closely paralleled somatomedin C levels. Therefore the anabolic state of metabolism at the end of pregnancy was characterized by high somatomedin C and insulin and relatively low somatotropin, whereas the catabolic state of early lactation was characterized by high somatotropin, low somatomedin C, insulin and thyroid hormones.

scholarly journals Production response in dairy cows milked two or three times a day: A meta-analysis

2020 ◽  
Vol 7 (2) ◽  
Author(s):  
Juan Isidro Sanchez-Duarte ◽  
Alvaro Garcia ◽  
Karla Rodríguez-Hernández ◽  
David G. Reta-Sánchez ◽  
Homero Salinas-Gonzalez ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Milk Production ◽  
Milk Fat ◽  
Dry Matter ◽  
Milk Protein ◽  
Meta Analysis ◽  
Milk Composition ◽  
Fat Percentage ◽  
Milking Frequency ◽  
Production Response

The objective was to evaluate the effects of two (2×) vs three (3×) times per day milking on milk production and milk composition in dairy cows. Fourteen scientific papers, containing production data from 16 trials, where dairy cows were milked 2× or 3×, were analysed using meta-analysis with fixed and random-effects with the R statistical program. The degree of heterogeneity and publication bias were measured with the I2 statistic and Begg’s test, respectively. In addition, the meta-regression analysis explored other sources of heterogeneity for the response. The estimated effect size of 2× and 3× milkings was calculated for dry matter intake (DMI), milk production, and milk composition. Dry matter intake, milk production, and milk fat and protein yields showed substantial heterogeneity (I2>50%). Whereas milk fat-percentage had moderate heterogeneity (I2<50%), and milk protein had no (I2=0%)heterogeneity. The year of publication, trial duration, and cattle breed did not influence production response parameters to milking frequency. We found no evidence of publication bias for the parameters evaluated (Begg’s test; P>.05). Cows milked 2× produced less milk (2.23 kg/d), less milk fat (0.06kg/d), and less milk protein (0.05 kg/d). In contrast, the fat percentage was lower (0.07 units) in 3×, compared with 2× milking frequency. There was no effect of milking frequency on DMI and milk protein percentage. In conclusion, milk production and milk fat and protein yields improves as milking frequency increase from 2× to 3× daily, without affecting DMI. The implementation of 3× milking frequency must consider dairy cow management, labor, and milking parlour infrastructure, particular to each dairy farm.

The effect of sodium fertilisation of pasture on herbage production and the performance of lactating dairy cows

1993 ◽  
Vol 1993 ◽  
pp. 41-41
Author(s):  
A. Cushnahan ◽  
F.J. Gordon
Keyword(s):  
Dairy Cattle ◽  
Dairy Cows ◽  
Recent Work ◽  
Milk Production ◽  
Climatic Conditions ◽  
Present Series ◽  
Optimum Level ◽  
Pasture Production ◽  
Lactating Dairy Cows ◽  
Production Response

Recent work by Chiy and Phillips (1991, 1992) has shown that the application of sodium (Na) fertiliser can produce improvements in pasture growth, pasture composition and the performance of grazing dairy cattle. However other studies have shown much smaller or zero effects in terms of pasture production following Na application (Smithet al., 1983; O'Connoret al., 1989). The objective of the present series of studies was to examine the milk production response to Na fertilisation of pasture under a differing set of soil and climatic conditions and to establish if there was an optimum level of Na input. In addition it was important to pursue the mechanisms of any animal production responses recorded. A series of studies were therefore undertaken to examine: (a) the influence of Na fertilisation of pasture on dairy cattle performance in comparison with any effects obtained through dietary Na supplementation, and (b) the effects of Na on herbage production, composition and digestibility.

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