Lactation trend of milk solid-not-fat in two-breed crosses of cattle at an organized farm

The milk solid-not-fat (SNF) averaged to 8.54±0.01, 8.50±0.01 and 8.65±0.02 per cent respectively in Holstein Friesian x Hariana (FH), Brown Swiss x Hariana (BH) and Jersey x Hariana (JH) crosses of cattle and showed significant (P<0.01) effect of month of lactation and season of calving. The observed trend revealed that milk SNF decreased successively after calving to its lowest levels during fifth month and increased thereafter at subsequent months of lactation in two-breed crosses of cattle. The gamma type function in FH and JH groups and quadratic function in BH group were adjudged as best representative nonlinear models explaining lactation trend of milk SNF in two-breed crosses of cattle. The fitted models to least squares means at ten monthly points of lactation described the decreasing trend of milk SNF after calving to lowest levels of 8.40, 8.34 and 8.52 percent at 4.36, 5.78 and 4.89 months of lactation in FH, BH and JH groups respectively and increasing trend thereafter during the lactation in close agreement to its observed trend in two-breed crosses of cattle.