Effect of Undegradable Dietary Protein Level and Plane of Nutrition on Lactation Performance in Crossbred Cattle

Abstract

An experiment was conducted in order to assess the effect of level of RDP:UDP ratio and level of feeding concentrate on milk yield, milk composition and nutrient utilization in lactating crossbred cattle. Twenty four medium producing (~10 kg/d, 45 to 135 days postpartum) lactating crossbred cows were divided into four groups of six animals each in a 2×2 factorial completely randomized design. The cows in group 1 were fed concentrate mixture I containing 59:41 RDP:UDP ratio (low UDP) at normal plane (LUDP+NP), in group 2 were fed low UDP ration at 115% of NRC ( 1989) requirements (LUDP+HP), whereas cows in group 3 were fed concentrate mixture II containing 52:48 RDP:UDP ratio (high UDP) at normal plane (HUDP+NP) and in group 4 were fed high UDP ration at 115% of NRC (1989) requirements (HUDP+HP). Green jowar was fed ad libitum as the sole roughage to all the animals. The experimental feeding trial lasted for 105 days. The total dry matter intake (DMI), DMI/100 kg body weight, DMI/kg W 0.75 , digestibilities of DM, OM, CP, CF, EE and NFE and intakes of TDN and DCP did not differ significantly among the different groups and also due to both UDP level and plane of nutrition and also due to their interaction. The total dry matter intake varied from 145 g in group 1 (LUDP +NP) to 152.57 g/kg W 0.75 in group 2 (LUDP+HP) diet. However, increase in milk yield with increased UDP level and also with increased plane of nutrition was observed consistently throughout the experimental period. The average milk yield was 7.66, 8.15, 8.64 and 9.35 kg in groups 1, 2, 3 and 4, respectively and there was no significant difference in milk yield among different groups of cows. The overall daily average milk yields in cows fed with low and high UDP diets were 7.91 and 8.99 kg, respectively and at normal and higher plane of feeding the milk yields were 8.15 and 8.75 kg/day, respectively. Thus, there was 13.65% increase in milk yield due to high UDP level and 7.36% due to higher plane of feeding. The daily 4% FCM yields were 9.20 kg for low UDP diet and 10.28 kg for high UDP diet, whereas it was 9.11 kg at normal plane of feeding and 10.37 kg at higher plane of feeding. Fat yields for the corresponding treatment groups were 0.37, 0.43, 0.41 and 0.48 kg, respectively. The 4% FCM yield and also fat yield did not differ significantly among different dietary treatments and also due to UDP level and plane of nutrition, however, 4% FCM yield was increased by 11.74% with high UDP level and 13.83% with higher plane of feeding. The values for total solids, fat, lactose, solids-not-fat and gross energy contents in milk differed significantly (p<0.05) among the different groups and were significantly (p<0.05) higher in milk of cows fed LUDP+HP diet followed by HUDP+HP diet. Total solids (14.65 and 13.83%), lactose (5.44 and 4.92%), solids-not-fat (9.44 and 8.83%) and gross energy (887 and 838 kcal/kg) of milk decreased significantly (p<0.05) with increased UDP level while total solids (13.84 and 14.64), fat (4.84 and 5.36%) and gross energy (832 and...

Effect of Varying Dietary Rumen Undegraded Protein on Nutrient Intake, Nutrient Digestibility and Production Performance in Early Lactating Crossbred Cows

“…The results of the present study supported the findings of Kumar et al (2005) who reported 13.7% increase in milk production in crossbred cattle when dietary RUP increased from 41 to 48 of dietary CP. Chaturvedi and Walli, (2001) also reported increased (8.2%) milk yield with increasing dietary RUP from 29 to 56%.…”

“…Increase rate of fiber digestion by dairy cows fed diets containing increased RUP was also noticed (Lallo, 1996). In another study (Kumar et al, 2005) CP, DM and NDF digestibility increased with increasing dietary RUP of CP from 41 to 48%. Similar findings were also reported by Pattanaik et al (2003) in calves where NDF digestibility enhanced by increasing RUP level from 45 to 51% of dietary CP.…”

Effect of Creep Feeding of Lambs and Plane of Nutrition of Ewes on the Productive Performance of Ewes During Suckling Period

“…These results agreed with Kumar et al (2005), who found that fat yield did not differ significantly among planes of nutrition. These results are in contrast with Weerasinghe et al (2012), who found that the milk fat yield was increased by 15% (P<0.001) in ewes receiving the high metabolizable protein diet.…”

Effect of by-pass protein supplements on milk production of dairy cattle

“…The higher milk yield in bypass protein supplemented cows may be due to increased supply of amino acids for absorption in small intestine. Similar results of increased milk yield fed with by-pass protein were presented by (Kunju et al,1990;Kumar et al, 2006).Similarly, Chaturvedi et al (2001), Schor (2001), Garg et al (2002a), Garg et al (2003b) and Mishra et al (2006) recorded significantly higher average milk yield in cows due to supplementation of bypass protein. Milk composition: Average milk fat percentage for groups T 0 , T 1 and T 2 was 5.52, 5.55 and 4.47%, respectively.…”