poultry requirments for vitamins and minerals are met from two sources feed ingredients and premixes.in practical poultry nutrition, the role of feed ingredients is over looked. this experiment was conducted to evaluate the effects of the time of vitamin and mineral premixes withdrawal on growth and economic performance of broilers. four hundred and fifty, one day-old male broiler chickens (ros...

Performance of ruminants is influenced by the proportion of nutrients in their daily feed intake. Protein and energy are the main determinants in the ruminant feed that can alter the animal’s performance. However, in developing countries ruminants are mainly fed on crop residues generally receiving only 62% of their crude protein (CP) requirements (Sarwar et al. 2002). Feeding ruminants accordi...

BACKGROUND:Herbal methionine can be compared relative toDl-methionine with evaluation of bioavailability of this source ofmethionine. OBJECTIVES: An experiment was carried out todetermine the relative bioefficacy of herbal methionine (H-Met)®relative to DL-methionine (DL-Met) on performance criteria andimmunocompetence of Met sources in male broilers. Atotal of 160male broilers were fed a Met-d...

Abstract Introduction The steep population decline of the emblematic monarch butterfly is caused mainly by reduction food sources for caterpillars and adults, as well disturbance in its overwintering forests. Although feeding at sites Mexico has long been considered unimportant, observations show that butterflies feed inside outside their forests on sunny days. Nectaring close to hibernation co...

A study was designed to collect a database of Iowa feedlot rations for determination of effective neutral detergent fiber (NDF) in complete diets from fiber analysis and particle size determination of individual feed ingredients and compare this with particle size determination of mixed wet rations. Seventy-one beef finishing total mixed rations were collected by ISU Extension Beef Field Specia...