Acta Univ. Agric. Silvic. Mendelianae Brun. 2011, 59(6), 17-24 | DOI: 10.11118/actaun201159060017

The effect of inorganic and organic form of zinc on digestibility of nutrients in dairy cows in three stages of reproductive cycle

Marie Balabánová, Šárka Hošková, Ladislav Zeman
Ústav výživy zvířat a pícninářství, Mendelova univerzita v Brně, Zemědělská 1, 613 00, Brno, Česká republika

The aim of our experiment was to compare the effect of feeding inorganic and organic forms of zinc in premix on the coefficient of digestibility of nutrients in the feeding ration for cows in three stages of reproductive cycle - 14 d before calving and 30 and 60 d after calving. The experiment was carried out on 19 Holstein cows that were divided into two groups. A control group of nine cows designated as "Inorganic zinc form" (IZF) was fed a diet supplemented with mineral premix containing inorganic form of zinc (ZnO). An experimental group of ten cows designated as "Organic zinc form" (OZF) had zinc oxide replaced with zinc fixed to methionine (Khei-chelate Zn powder 15% by Kheiron). The experiment was divided into three periods - the first period lasted from 14th day before calving until 2nd day after calving, the second period lasted from 3rd day to 30th day after calving and the third period lasted from 31st day to 60th day after calving. Cows were fed the diet based on maize silage, lucerne haylage, sugar beet pulp silage, grass or lucerne hay and concentrate containing premix with either inorganic or organic zinc form. During the experiment samples of feeding ration and faeces were taken in 3 intervals, it si on 14th day before calving, on 30th day and on 60th day after calving to determine nutrients content. Digestibility of nutrients was calculated using indicator method (ash insoluble in 3 M HCl).
After feeding organic forms of zinc a tendency to higher digestibility of crude protein, fat, crude fiber, nitrogen-free extracts, ash and zinc was observed in cows regardless of stage of reproductive cycle. The digestibility of the zinc and fiber were the most increased. Digestibility of zinc in OZF on 14th day before calving was higher than in IZF (P < 0.05). Feeding of organic zinc forms had downward effect only on the digestibility of copper.

Keywords: crude protein, crude fiber, fat, ash, copper
Grants and funding:

The work was written within the framework of Grant TP8/2010 funded by the Internal grant Agency of Mendel University in Brno (IGA) and MIKROP, a. s.

Received: April 13, 2011; Published: March 16, 2014  Show citation

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Balabánová, M., Hošková, Š., & Zeman, L. (2011). The effect of inorganic and organic form of zinc on digestibility of nutrients in dairy cows in three stages of reproductive cycle. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 59(6), 17-24. doi: 10.11118/actaun201159060017
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