SUPPLEMENTARY FEEDING ON THE NUTRIENT BALANCE OF LACTATING DAIRY COW AT CONTRASTING TEMPERATURE REGIMES: ASSESSMENT USING CORNELL NET CARBOHYDRATE AND PROTEIN SYSTEM (CNCPS) MODEL
Abstract: Dairy cows often do
not receive adequate nutrient supply during their lactation period. This
condition caneven be worse if the environmental temperature is not in
comfortable range which may occur especially intropical regions. The present
research was aimed to simulate the effect of supplementary feeding on
nutrientbalance of lactating dairy cow at contrasting temperature regimes using
Cornell Net Carbohydrate andProtein System (CNCPS) model. Treatments consisted
of feeds (R1: Pennisetum purpureum, R2: P.purpureum + concentrate (60:40), R3:
P. purpureum + Gliricidia sepium + Leucaena leucocephala(60:20:20), R4: P.
purpureum + concentrate + G. sepium + L. leucocephala (60:20:10:10)) and
environmentaltemperatures (T1: 20 oC, T2: 30 oC). The dairy cow inputs in CNCPS
were Holstein breed, body weight of500 kg, feed intake of 15 kg (dry matter
basis) per day and produced milk 15 kg/day. Based on the CNCPSmodel, there were
negative balances of metabolisable energy (ME) and metabolisable protein (MP)
if alactating dairy cow fed only by P. purpureum. The ME balance was worse at
higher temperature, while theMP balance was remain unchanged. Addition of
concentrate mixture (R2) fulfilled the ME and MPrequirements as well as other
nutrients. Addition of leguminous tree leaves (R3 and R4) improved thenutritional
status of the lactating cow model compared to R1, but did not better than R2.
It was concludedthat supplementary feeding is necessary for improving the
nutrient balance of lactating dairy cow, especiallywhen the cow is maintained
under uncomfortable environmental temperature.
Author: A. Jayanegara, A.
Sofyan
Journal Code: jppeternakangg090025
