ABSTRACT.
WET SUGAR BEEF PULP AS FEED FOR LACTATING COWS

Ernesto Jahn B.1, Germán Klee G.2 y Walter Bonilla E.3
 

Wet and dry sugar pulp were evaluated with lactating cows. In trial 1, 10 Holstein cows were used in a switch back design to compare ad libitum feeding of wet and dried sugar beet pulp. The animal also received 1.5 Kg of rape seed meal and 0.2 Kg of a mineral mixture, per animal per day. Fat corrected milk (4% FCM) was 10.4 and 9.3 Kg/day (P < 0.05) for dried and wet sugar beet pulp, respectively. Beet pulp dry matter (DM) intake was 11.3 and 8.0 Kg/cow/day for the same treatments, respectively. In trial 2, 18 Holstein cows were used in a complete ramdomised block design during a 120 days period, to compare three treatments: I) dried sugar beet pulp ad libitum; II) wet beet pulp ad libitum; and III) dried beet pulp, approximately, 50% of the dry matter intake of treatment I), plus wet beet pulp ad libitum. The cows also received 1,6 Kg of rape seed meal and 0.2 Kg of a mineral mixture/cow/day. FCM production was 7.5, 8.8 and 8.4 Kg/cow/day (P > 0.05) for treatments I), II) and III), respectively. Total DM intake was 8.7, 10.6 and 10.4 kg/day (P > 0.05) for the same treamensts, respectively. In both trials milk fat was low and varied between 2.5 and 2.9%, and there was no difference bet ween treatments (P > 0.05). DM intake, obtained with wet or dried sugar beet pulp, was not adequate to meet nutrient requirements of cows with a milk production of 10 - 12 Kg/day.
Sugar beet pulp should be used in combination with hay or silage for dairy cattle rations during winter. Energy supplied by dried or wet sugar beet pulp was similar on a dru matter basis.

Keywords:
1Ing. Agr., Ph.D., Estación Experimental Quilamapu, Instituto de Investigaciones Agropecuarias (INIA), Casilla 426,, Chillán,, Chile.
2Ing. Agr., Subestación Experimental Humán, Instituto de Investigaciones Agropecuarias (INIA), Casilla 767, Los Angeles, Chile.
3Méd. Vet., Estación Experimental Quilamapu, Instituto de Investigaciones Agropecuarias (INIA), Casilla 426, Chillán, Chile.