Effects of undegradable dietary protein on milk production and composition of lactating dairy cows

This experiment was conducted in order to evaluate the effect of undegradable dietary protein (UDP) level on milk production and composition of 24 lactating dairy cows. Treatments consisted of T0: ) control diet without UDP (forage and concentrate were offered in total mixed ration); T1: control diet without UDP (forage and concentrate were offered separately); T2: control diet + UDP 40 gr/L milk + mineral mix; and T3: control diet + UDP 60 gr/L milk + mineral mix. Data were analyzed using analysis of variance (ANOVA) and the differences between treatment means were examined by duncan multiple range test (DMRT). The results showed that UDP supplementation significantly (p<0.05) affected nutrient consumption (dry matter, organic matter, crude protein and total digestible nutrient). In addtion, UDP supplementation significantly increased milk production and 4 FCM production (p<0.05). A higher level of milk production and 4 FCM yielad in animals fed with T2 and T3. Thus, UDP supplementation may be an alternative supplement for the lactating dairy cows. © Published under licence by IOP Publishing Ltd.