GROWTH AND DEVELOPMENT INDICATORS BY AGE PERIODS OF LOCAL AND CROSSBRED CALVES RAISED UNDER DIFFERENT FEEDING TECHNOLOGIES (TRADITIONAL AND TMR)
Jabborov Sh.Sh.
Scientific Research Institute of Livestock and Poultry, PhD, Senior Researcher
Nurmatov A.A.
Scientific Research Institute of Livestock and Poultry, Candidate of Agricultural Sciences, Senior Researcher
Khafizov I.I.
Scientific Research Institute of Livestock and Poultry, Candidate of Agricultural Sciences, Senior Researcher
Khasanov B.B.
Scientific Research Institute of Livestock and Poultry, PhD
Mardonov J.T.
Scientific Research Institute of Livestock and Poultry, Researcher
Kaniyazova A.A.
Scientific Research Institute of Livestock and Poultry, Researcher
Keywords: calf, TMR technology, traditional feeding, live weight, absolute gain, average daily gain, relative growth, local breed, crossbred, coefficient of variation.
Abstract
The article analyses live weight, absolute gain, average daily gain and relative growth by age periods in local and local×Holstein crossbred calves kept under traditional and TMR (Total Mixed Ration) feeding technologies, based on a study conducted in rural households of the “Tomosha” mahalla, Furqat district, Fergana region. The study was carried out in four experimental groups of 20 head each (I and II — local bull calves and heifer calves aged 6–12 months, fed traditionally and with TMR, respectively; III and IV — local and crossbred heifers aged 12–18 months, fed traditionally and with TMR, respectively). The results showed that live weight and growth rate in the TMR groups were significantly higher (P>0.95–P>0.999) than in the traditionally fed groups at all age periods, and that crossbred heifers showed higher growth energy than their local counterparts under both traditional and TMR feeding.
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