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Performance of forage maize at high latitudes

plant development, agronomy and nutritive value

Mussadiq, Zohaib (2012). Performance of forage maize at high latitudes. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2012:54
ISBN 978-91-576-7701-3
[Doctoral thesis]

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Abstract

Following the development of earlier maturing hybrids the cultivation of forage maize (Zea mays L.) in Northern Europe has markedly increased in recent decades. This has raised needs for greater knowledge regarding the performance of forage maize in marginal areas, such as Sweden, under current conditions. Thus, the aim of the studies presented in this thesis was to assess the utility of different techniques for evaluating the agronomic performance and nutritive values for ruminants of maize hybrids grown at high latitudes.

The development of selected maize hybrids was graded during their reproductive growth stages, and the nutritive values of both the whole plants and plant fractions were analyzed using available analytical techniques, inter alia chemical, in vitro, in situ procedures and near infrared spectroscopy (NIRS). The results showed that longer cultivation times are required by maize hybrids in order to accumulate sufficient crop heat units to reach given developmental stages at high latitudes. Thus, the plants may remain immature with high moisture contents, low agronomic and nutritive values at harvest. Dry matter (DM) yields were highest for relatively late maturing hybrids (FAO 210), but the earliest maturing hybrid (FAO 180) had the highest fractional proportion of kernels and neutral detergent fibre digestibility (NDFD) at harvest. Hence, the DM intake and performance of ruminants should be highest if fed the latter. Since the maize hybrids showed nutritional differences at a given maturity (DM concentration g/kg), the effects of maturation should be addressed in trials designed to compare their potential nutritive performance.

The in vitro gas production technique showed potential utility for assessing the nutritional value of forage maize, particularly the contributions of specific morphological fractions to whole plant performance. Increasing maturity reduced the in vitro NDFD in all plant fractions, but increased the rate of rumen degradation of organic matter in the whole plants due to increases in starch concentration. This conclusion was corroborated by multivariate analysis of forage nutritive value parameters using the MILK 2006 model.

The evaluation of analytical techniques revealed that most tested techniques gave biased predictions of the investigated parameters and that a new calibration set would most likely improve the validity of the NIRS predictions. Overall, the results from the studies underlying this thesis indicate that the agronomic and nutritional value of forage maize hybrids cultivated at high latitudes will depend on their DM maturity at harvest, and thus on both the site and the hybrid.

Authors/Creators:Mussadiq, Zohaib
Title:Performance of forage maize at high latitudes
Subtitle:plant development, agronomy and nutritive value
Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :2012
Volume:2012:54
Number of Pages:55
Papers/manuscripts:
NumberReferences
I.Z. Mussadiq, M. Hetta, C. Swensson and A–M. Gustavsson (2012). Plant development, agronomic performance and nutritive value of forage maize depending on hybrid and marginal site conditions at high latitudes. Acta Agriculturae Scandinavica. B–Plant and Soil Science 62, 420–430.
II.M. Hetta, Z. Mussadiq, A–M. Gustavsson and C. Swensson (2012). Effects of hybrid and maturity on performance and nutritive characteristics of forage maize at high latitudes, estimated using the gas production technique. Animal Feed Science and Technology 171, 20–30.
III.Z. Mussadiq, A–M. Gustavsson, P. Geladi, C. Swensson and M. Hetta (2012). Multivariate models of the predicted milk yield and forage quality depending on growing site, plant maturity, contribution and nutritional quality of morphological fractions (submitted).
IV.Z. Mussadiq, S. J. Krizsan, M. Hetta, M. Ramin and P. Huhtanen (2012). Predicting feed value of forage maize hybrids harvested at different maturity and sites (manuscript).
Place of Publication:Umeå
Publisher:Dept. of Agricultural Research for Northern Sweden, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-7701-3
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F01 Crop husbandry
F Plant production > F62 Plant physiology - Growth and development
L Animal production > L02 Animal feeding
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 402 Animal and Dairy Science > Animal and Dairy Science.
Agrovoc terms:zea mays, maize, feed grasses, quality, nutritive value, maturity, digestibility, dry matter content, site factors, latitude
Keywords:Forage maize, maturity, crop heat units, dry matter, gas production, neutral detergent fibre, digestibility
URN:NBN:urn:nbn:se:slu:epsilon-e-574
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-574
ID Code:8973
Department:(NL, NJ) > Dept. of Agricultural Research for Northern Sweden
(VH) > Dept. of Agricultural Research for Northern Sweden
Deposited By: Mr Zohaib Mussadiq
Deposited On:22 Aug 2012 10:06
Metadata Last Modified:02 Dec 2014 10:51

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