The responses of lactating dairy cows to diets based on grass silage of high or low DM and supplemented with fast and slowly fermentable energy sources

1997 ◽  
Vol 1997 ◽  
pp. 84-84
Author(s):  
D. L. Romney ◽  
V. Blunn ◽  
J. D. Leaver
Keyword(s):  
Dairy Cows ◽  
Milk Yield ◽  
Feeding Behaviour ◽  
Nutrient Absorption ◽  
Energy Sources ◽  
Grass Silage ◽  
Lactating Dairy Cows ◽  
The Difference ◽  
Present Trial

It has often been observed that increasing silage DM through wilting increases DM intake, although digestibility and efficiency of utilisation of nutrients tends to decrease, resulting in poor responses in terms of milk yield. Rapid solubilisation of nutrients in the rumen may give rise to rapid nutrient absorption, activating satiety mechanisms and resulting in shorter meals. In the present trial the difference in DM content of the silages was high (>200g/kg). Supplements based on different energy sources were fed to determine whether synchronisation of release of nutrients from the silage and the supplement modified DM intake and feeding behaviour.

Effect of nutrient demand and level of supplement on the intake and feeding behaviour of dairy cows offered grass silage

1998 ◽  
Vol 1998 ◽  
pp. 194-194
Author(s):  
D.L. Romney ◽  
V. Blunn ◽  
J.D. Leaver
Keyword(s):  
Dairy Cattle ◽  
Dairy Cows ◽  
Milk Yield ◽  
Feeding Behaviour ◽  
On Demand ◽  
Grass Silage ◽  
Nutrient Demand ◽  
Yield Level

The nutrient demand of dairy cattle varies with milk yield level and is greater in early than in later lactation. This is likely to influence forage feeding behaviour and intake, although the mechanisms are not well understood. The objectives of this experiment were to examine the feeding behaviour of dairy cows in early and late lactation (representing two levels of nutrient demand), and at three levels of concentrate supplement (representing three dietary influences on demand for forage).

Effect of silage feeding system and concentrate composition on the performance of lactating dairy cows.

1987 ◽  
Vol 1987 ◽  
pp. 31-31
Author(s):  
R.H. Phipps ◽  
J.D. Sutton ◽  
R.F. Weller
Keyword(s):  
Dairy Cows ◽  
Milk Fat ◽  
Feeding System ◽  
High Quality ◽  
Grass Silage ◽  
Lactating Dairy Cows ◽  
Major Energy Source ◽  
Frequent Feeding ◽  
Ad Libitum ◽  
Present Trial

The “low milk fat” syndrome and “off feed” problems have long been associated with the use of rations incorporting a high proportion of starch based concentrate. These problems can be ameliorated by frequent feeding of concentrate, the use of out of parlour feeders or complete diets. Another approach has been to examine alternatives to cereal starch as the major energy source for concentrate supplements. Since few comparisons of concentrates containing a mixture of high quality fibre sources have been reported, the present trial was designed to compare concentrates based on cereal starch with those containing a mixture of high quality fibre sources when given with ad libitum grass silage from calving. An additional aim was to compare individual feeding through Calan Broadbent gates with groups fed forage at a self-feed clamp.

Relationships between blood composition and fertility in dairy cows – a field study

1977 ◽  
Vol 44 (1) ◽  
pp. 1-7 ◽  
Author(s):  
G. J. Rowlands ◽  
W. Little ◽  
B. A. Kitchenham
Keyword(s):  
Dairy Cows ◽  
Milk Yield ◽  
Total Protein ◽  
Inorganic Phosphate ◽  
Metabolic Profile ◽  
Serum Urea ◽  
Blood Samples ◽  
Stage Of Lactation ◽  
Lactating Dairy Cows ◽  
The Difference

SummaryThree hundred and fifty-one lactating dairy cows, which were between 40 and 100 d post-calving, were selected from cows sampled during metabolic profile testing of 21 herds. Blood samples were analysed for packed cell volume (PCV), blood glucose and haemoglobin, and serum urea-N, albumin, total protein, inorganic phosphate, Ca, Mg, Na, K, Cu and Fe. After adjusting for herd and date of sampling and each cow's age, stage of lactation, milk yield and interval from calving to first service, concentrations of albumin and K (P < 0·01) and PCV (P < 0·05) were inversely related and concentrations of globulin (derived as the difference between total protein and albumin) directly related (P < 0·05) to the number of services required for conception. Conception rates to first service were inversely related to lactation number but not to milk yield on day of sampling.

The effect of silage preference on the performance of dairy cows

1986 ◽  
Vol 1986 ◽  
pp. 7-7
Author(s):  
R.F. Heller ◽  
R.H. Phipps
Keyword(s):  
Dairy Cows ◽  
Crude Protein ◽  
Free Choice ◽  
Young Stock ◽  
Grass Silage ◽  
Lactating Cows ◽  
Lactating Dairy Cows ◽  
Ad Libitum ◽  
And Performance ◽  
Present Trial

Numerous factors such as the digestibility value, fermentation characteristics and chop length of silage have all been shown to increase the intake and performance of dairy cows.Although the effect of silage preference has been examined with young stock and dry cows there has only been a limited number of studies involving lactating cows.The aim of the present trial was to determine the effect on intake and performance of lactating dairy cows offered either grass silage alone, a mixture of grass and maize silages blended in a ratio of 1:2 or a free choice of grass and maize silages.Thirty-three British Friesians in weeks 17-24 of lactation were used in the study. All animals received 6 kg/d of a concentrate supplement containing 190 g/kg DM of crude protein and 12.8 MJ ME/kg CM and allowed ad libitum access to the silages.

Choice of grass or maize silages by lactating dairy cows: influence of supplementary protein, concentrate level and milk yield

2006 ◽  
Vol 82 (4) ◽  
pp. 469-477 ◽  
Author(s):  
M. Habib ◽  
J.S. Syed ◽  
J.D. Leaver
Keyword(s):  
Dairy Cows ◽  
Milk Yield ◽  
Feeding Behaviour ◽  
Latin Square ◽  
Latin Squares ◽  
Protein Supplementation ◽  
Preference Testing ◽  
Yield Level ◽  
Lactating Dairy Cows ◽  
Concentrate Level

AbstratPreference testing of two foods provides a means of assessing the relative value an animal places on the foods. Two experiments examined the relative choice of grass and maize silages by lactating dairy cows, and investigated whether protein supplementation, concentrate level or milk yield level of cow influenced this choice. In experiment 1, 16 cows including eight high (30 kg/day) and eight low (17 kg/day) yielding (milk level, ML) cows were offered a low (171 g/kg dry matter (DM)) or a high (300 g/kg DM) crude protein (CP) concentrate in eight 2×2 Latin squares. In experiment 2, four cows were offered a low (112 g/kg DM) or a high (334 g/kg DM) CP content of concentrate at a low (3·5 kg/day) or high (7 kg/day) concentrate level (CL) in a 4×4 Latin-square design.CP of concentrate did not influence the proportion of grass silage to maize silage eaten in either experiment. Also, neither ML of cows (experiment 1) nor CL (experiment 2) affected proportions of the two silages eaten. The mean proportions selected were 0·88:0·12 and 0·52:0·48 for grass and maize silages in experiments 1 and 2 respectively, which reflected differences between experiments in the digestibilities of the silages, and indicated that digestibility may be an important factor influencing the choice of silages.The CP, CL and ML treatments produced significant responses in silage and total DM intakes. Feeding behaviour studies showed the responses to CP were associated with differences in meal size, which is a function of duration of each meal and rate of intake. The number of meals taken per day was similar for all treatments and averaged 8·0 and 8·1 for experiments 1 and 2 respectively.It was concluded that whilst lactating cows modified their feeding behaviour in response to the diets available, there was no evidence they modified the proportions of the two silages selected in order to meet a target protein content in the total diet. It would appear therefore that other factors, of which digestibility may be important, have a higher priority in choice.

scholarly journals Effects of ruminally protected amino acids on milk yield and blood components of early lactating dairy cows fed grass silage-based diet.

2002 ◽  
Vol 73 (3) ◽  
pp. 417-422 ◽  
Author(s):  
Tsutomu OHGI ◽  
Yashuhiro MINEZAKI ◽  
Mamiko FUJITA ◽  
Masaaki HANADA ◽  
Masanobu TAKAHASHI ◽  
...  
Keyword(s):  
Amino Acids ◽  
Dairy Cows ◽  
Milk Yield ◽  
Blood Components ◽  
Grass Silage ◽  
Lactating Dairy Cows

Intake, digestibility and feeding behaviour of grazing dairy cows supplemented with common bean (Phaseolus vulgaris L.) residue

2020 ◽  
Vol 60 (13) ◽  
pp. 1607 ◽  
Author(s):  
A. M. Zanine ◽  
A. A. Fonseca ◽  
M. D. Ribeiro ◽  
F. P. Leonel ◽  
D. J. Ferreira ◽  
...  
Keyword(s):  
Dairy Cattle ◽  
Dairy Cows ◽  
Common Bean ◽  
Milk Yield ◽  
Feeding Behaviour ◽  
Neutral Detergent Fibre ◽  
Lactating Dairy Cows ◽  
Cattle Systems ◽  
Daily Milk Yield ◽  
Daily Milk

Context In Brazil, dairy cattle pasture-based systems use grass pasture as the main feed source, with little or no supplementation. However, it is necessary to invest in nutritional technologies that allow dairy cattle systems to produce milk with a high protein and energy content, and better total bacterial counts at low costs. Aims This study aimed to evaluate the effect of adding a common bean residue (CBR) to cattle diets on feed intake, digestibility and feeding behaviour of lactating dairy cows. Methods Eight lactating Holstein × Zebu crossbred cows, with an average bodyweight of 500 ± 30 kg (mean ± s.d.) and a mean daily milk yield of 13 ± 2 kg/cow were randomly assigned in a double 4 × 4 Latin square. The treatments consisted of four increasing levels of CBR (134, 240, 348 and 449 g/kg) in the concentrate. Key results The inclusion of CBR linearly decreased (P ≤ 0.034) the DM intake and neutral detergent fibre intake of pasture, sugarcane and the total diet. The inclusion of CBR did not affect (P ≥ 0.111) grazing, rumination or idle time. The feeding efficiency in kg DM/h and kg neutral detergent fibre corrected for ash and protein/h linearly decreased (P &lt; 0.001), with an estimated decrease of 39.1 and 23.4 g/h respectively for every 10 g/kg of CBR added to the concentrate. The number of boluses per day and the time spent per ruminated bolus were not affected (P ≥ 0.086) by CBR inclusion. Conclusions The results obtained in this study indicate that the inclusion of up to 240 g/kg of CBR to the diets of lactating dairy cows with a mean daily milk yield of 13 kg, managed on pastures, is recommended. Implications The use of CBR, which has high availability in several countries, may be an alternative to supplying small ruminants.

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