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Effects of the level, type and processing of cereal grains in diets for dairy cows

feed intake and performance

Tahir, Muhammad Naeem (2012). Effects of the level, type and processing of cereal grains in diets for dairy cows. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2012:53
ISBN 978-91-576-7700-6
[Doctoral thesis]

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Milk yield in dairy cows is directly dependent on their feed or energy intake. Due to genetic improvements, dairy cows have increased their potential for milk yield. This implies that the animal's energy requirements are drastically increased. The presence of both physical and metabolic mechanisms for intake regulation and dynamic nature of lactating dairy cows has made ration formulation a challenging enterprise. Few strategies of ration formulation can be adapted to simultaneously address the issue of intake regulation and stimulate feed intake and milk yield in dairy cows. Strategies that may be useful in achieving these objectives include improving the grass silage quality and adjusting the rumen degradation of starch to match that of grass silage. Starch accounts for the bulk of the dry matter of cereal grains and has been shown to influence rumen functioning, fibre digestion and thereby animal performance. The overall aim of the studies presented in this thesis was to explore the scope for stimulating feed intake and milk yield in dairy cows through feeding management.

Three feeding experiments and one laboratory study were conducted. Paper I evaluated the effects of increasing the proportion of wheat in diets containing maize- and grass-silages. Paper II evaluated the effects of interactions between grass silage digestibility (high vs. medium) and concentrate starch type (barley vs. maize) in the diets. Paper III evaluated the effects of increasing the proportion of NaOH-treated wheat in grass-silage based diets, and Paper IV estimated the ruminal digestion kinetics of different cereal starch using the in vitro gas production technique and compared the gas production data to in vivo starch digestibility data.

The results obtained in Papers I-III indicated that the feed intake and milk yield were primarily affected by the level of concentrate and the digestibility of the grass silage in the diets. The results presented in Paper IV indicated that the differences between the digestion kinetics for starches of different origins are less than has been reported in literature, which is consistent with the results of feeding trials. Moreover, the predicted ruminal starch digestibility obtained using gas production data were in good agreement with the in vivo starch digestibility data.

Authors/Creators:Tahir, Muhammad Naeem
Title:Effects of the level, type and processing of cereal grains in diets for dairy cows
Subtitle:feed intake and performance
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :18 August 2012
Number of Pages:62
I.M. Hetta, M. N. Tahir & C. Swensson. (2010). Responses in dairy cows to increased inclusion of wheat in maize and grass silage based diets. Acta Agriculturae Scandinavica Section A-Animal Science 60 (4), 219-229.
II.M. N. Tahir, M. Hetta & P. Lund. The effects of and interactions between the maturity of grass silage and concentrate starch source when offered as total mixed rations on the performance of dairy cows and rumen degradation parameters. Animal (accepted)
III.M. Hetta, M. N. Tahir, S. J. Krizsan, A. Puranen & P. Huhtanen. Effects of the inclusion of sodium hydroxide treated wheat on the voluntary feed intake and milk production in dairy cows (submitted).
IV.M. N. Tahir, M. Hetta, M. Larsen, P. Lund & P. Huhtanen. In vitro estimations of the rate and extent of ruminal digestion of dried cereal feed fractions compared to in vivo data (submitted).
Place of Publication:Umeå
Publisher:Dept. of Agricultural Research for Northern Sweden, Swedish University of Agricultural Sciences
Associated Programs and Other Stakeholders:SLU - Research Areas for the Future > Future Agriculture (until Jan 2017)
SLU - Agricultural Sciences for Global Development > Efficiency in farming systems
ISBN for printed version:978-91-576-7700-6
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:L Animal production > L02 Animal feeding
L Animal production > L51 Animal physiology - Nutrition
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 402 Animal and Dairy Science > Animal and Dairy Science.
Agrovoc terms:dairy cows, feed intake, milk yield, animal nutrition, nutrition physiology, concentrates, silage, starch, digestibility, rumen digestion
Keywords:Concentrate supplementation, Grass silage digestibility, Intake regulation, Milk yield, Rumen escapable starch
Permanent URL:
ID Code:8984
Department:(NL, NJ) > Dept. of Agricultural Research for Northern Sweden
(VH) > Dept. of Agricultural Research for Northern Sweden
Deposited By: Mr. Muhammad Naeem Tahir
Deposited On:23 Aug 2012 08:40
Metadata Last Modified:02 Dec 2014 10:51

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