DOI: 10.36871/vet.zoo.bio.202102007
UDC 636.085.33

Authors

E. O. Krupin
Candidate of Veterinary Sciences, Leading Researcher, Tatar Scientific Research Institute of Agriculture, Federal Research Center «Kazan Scientific Center of the Russian Academy of Sciences», Kazan, Russian Federation
A. R. Khairullina
Researcher, Tatar Scientific Research Institute of Agriculture, Federal Research Center «Kazan Scientific Center of the Russian Academy of Sciences», Kazan, Russian Federation
A. T. Sabirzyanova
Research Engineer, Tatar Scientific Research Institute of Agriculture, Federal Research Center «Kazan Scientific Center of the Russian Academy of Sciences», Kazan, Russian Federation

Abstract

The article describes a retrospective analysis of the dynamics of energy and protein nutritional value of 555 samples of haylage from annual grasses selected in various agroclimatic zones of the Republic of Tatarstan in the period from 1993 to 2018. Studies have established a tendency for a slight decrease in the concentration of metabolizable energy in dry matter of haylage. The long-term average value of the level of exchange energy was 8,92 MJ/kg, which is 3,84% higher than the norm. The maximum content of exchangeable energy was established in 1996 (9,85 MJ/ kg). The minimum content was revealed in 2007 and amounted to 8,61 MJ/kg. The average long-term value of the concentration of net lactation energy in dry matter of haylage was 2,00 MJ/kg, which is 1,52% higher than the norm. The highest content of net energy of lactation was noted in 1996 and amounted to 3,14 MJ/kg, which is higher than the long-term average and the norm values by 57,00 and 59,39%, respectively. The lowest value was found in 2003, when the deviation from the norm was –27,23%. The content of digestible protein in 1 kg of dry matter of haylage from annual grasses tended to increase slightly. The average long-term value for this indicator was 89,19 g/kg, which is 20,74% higher than the norm. Only in 1996, the content of digestible protein was below the norm and amounted to 71,57 g/kg. The highest content was revealed in 2015 – 107,38 g/kg, which is 20,39 and 45,36% higher than the average long-term value and the value of the norm, respectively.

Keywords

feed, chemical composition, nutritional value, quality, metabolizable energy, digestible protein.