Adapted quality protein maize for broiler feeds
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Maize has low nutritional quality due to poor content of essential amino
acids lysine and tryptophan in the dominant seed storage protein fraction,
zeins. However, Quality Protein Maize (QPM), a variety of opaque2 maize
but with good agronomic traits, can have 60% to 100% higher content of
lysine than standard maize. Monogastric animals (pigs, poultry, fish), like
humans, cannot synthesize lysine and tryptophan de novo and thus these
amino acids must be supplied through diets. QPM was primarily developed
for human consumption to overcome malnutrition in countries where maize
is staple food. Thus, QPM is of tropical origin and its adaptation to temperate
regions is frequently hampered by the retained exotic germplasm.
Development of adapted QPM hybrids is mainly aimed for feed industry. It
has been shown that substituting standard maize with QPM in feed diets
could be profitable due to improved weight gain, feed conversion ratio and
decreasing of dietary lysine supplementat...ion. Maize Research Institute,
Zemun Polje has a program on converting elite inbred lines through marker
assisted breeding into their QPM counterparts and developing commercial
QPM hybrids. Up to now, two inbred lines have been converted, while eight
lines have passed through three or four generations of backcrossing and one
generation of selfing. Tryptophan content in the converted selfed plants was
in the range from 0.080 to 0.093. Besides developing QPM counterparts of
commercial hybrids, one QPM hybrid obtained by crossing a converted elite
inbred line and an adapted tropical inbred line was developed and tested over
different locations and in different years. This hybrid is currently used in
feeding experiments with the objective to test effects of replacing standard
maize with QPM in diets on broiler performances.
Кључне речи:
adapted QPM / inbred lines / hybrids / lysine / tryptophanИзвор:
International conference: "The frontiers of science and technology in crop breeding and production conference", Belgrade, 8-9.06.2021. - Book of abstracts, 2021, 75-Издавач:
- Belgrade : Maize Research Institute, Zemun Polje