Evaluation of carinata meal included in a total mixed ration fed ad libitum to dairy heifers.
American Dairy Science Association
Journal of Dairy Science
carinata meal, dairy heifer, growth performance
Our objective was to determine the effects on growth performance of dairy heifers when fed carinata meal in a TMR containing corn silage. Previous research from our group has found that limit-feeding carinata meal at 10% of the total diet in the concentrate mix with grass hay as the major forage maintained heifer growth. A 12-wk randomized complete block design study was conducted using 24 Holstein heifers [242.4 ± 34 d of age; BW 272.8 ± 45 kg]. Treatments were (1) control (CON) a TMR with grass hay, corn silage, and soybean meal and dried distillers grains with solubles as major concentrate ingredients; and (2) a TMR with 10% (DM basis) carinata meal (CRM) replacing a portion of the soybean meal in the grain mix. Diets were fed for ad libitum intakes and formulated to be isonitrogenous and isocaloric. Rations were fed to target 10% refusal rate and intakes were measured using Calan gates. Frame sizes, BW, and body condition scores (BCS) were measured on 2 d during wk 0, 2, 4, 6, 8, 10, and 12. Data were analyzed in MIXED procedures of SAS 9.4 with repeated measures. Heifer DMI was greater (P < 0.01) for CON (9.2, and 8.4 kg/d for CON and CRM, respectively; SEM = 0.25). Body weights (327.0 and 327.1 kg; SEM = 2.53), ADG (1.09 and 1.05 kg/d; SEM = 0.05), and gain: feed (0.12 and 0.13; SEM = 0.01) were similar (P > 0.05) between treatments. Withers height (128.0 and 128.1 cm; SEM = 0.28), body length (119.5 and 120.0 cm; SEM = 0.44) and BCS (2.99 and 2.97; SEM = 0.02) were also similar (P > 0.05). Greater heart girth (P < 0.01) was found for the CON heifers (153.3 cm and 152.0 cm; SEM = 0.39). Differences were not found (P = 0.18) for paunch girth (187.0 cm and 187.8 cm; SEM = 1.90) between 390 J. Dairy Sci. Vol. 101, Suppl. 2 treatments. The CRM fed heifers had greater (P < 0.01) hip width (40.0 cm and 40.4 cm; SEM = 0.24). Results indicated that replacing soybean meal with carinata meal at 10% of the ration and feeding as a TMR for ad libitum consumption maintained heifer body frame growth while decreasing DMI. Carinata meal shows potential as a feedstuff to be included in TMR fed to dairy heifers.
Lawrence, R. D. and Anderson, J. L., "Evaluation of carinata meal included in a total mixed ration fed ad libitum to dairy heifers." (2018). Dairy Science Publication Database. 1981.