Abstract #334

# 334
The effect of supplementing dairy cows with vitamins based on the BASF annual industry vitamin supplementation survey on productive and reproductive parameters.
M. Coelho*1, R. Jones1, F. Parks1, 1BASF Corp, Florham Park, NJ.

As the dairy industry strives for efficiency, the cell metabolic rate increases, and the neutrophil function decreases. In the last 15 years, there has been a 28% increase in milk production (33.9 to 39.5 kg/cow/d), a 12% decline in total-tract feed passage rate (9.72 to 8.52 h), and a 1% decline in DM digestibility (66.02 to 65.12). A study was conducted to determine the response of dairy cows to different levels of vitamin supplementation based on the 2018 BASF Industry vitamin supplementation survey (Coelho, 2018). A total of 835 Holstein cows were used in a randomized complete block design with cow as the experimental unit, treatment as the fixed effect, and block as the random effect (167 cows × 5 treatments). Cows were blocked by age, reproductive and productive performance, and were fed corn/corn silage diets formulated to meet or exceed 2001 NRC recommendations. Treatments were T1 = 2001 NRC, T2 = low 25%, T3 = AVG, T4 = high 25% and T5 = high 5% vitamin supplementation (Table 1). Vitamin supplementation significantly increased several productive and reproductive parameters. Bulk tank somatic cell count (T1 = 356, T2 = 194, T3 = 172, T4 = 161 and T5 = 146 cells/mL, P = 0.03, respectively; days dry (68, 60, 58, 56 and 56 d, P = 0.04, respectively); incidence of clinical mastitis (35.2, 19.7, 17.6, 12.0 and 11.7%, P = 0.03, respectively); conception rate of 1st service (32.1, 49.3, 52.7, 58.4 and 58.9%, P = 0.03, respectively); conception rate, all services (31.2, 45.7, 48.2, 53.1 and 53.1%, P = 0.02, respectively); heat detection rate (45.2, 63.5, 67.8, 72.1 and 73.0%, P = 0.03, respectively); calving interval (14.5, 13.6, 13.4, 13.1 and 13.0 mo, P = 0.04, respectively; peak milk, first lactation (37.2, 41.3, 42.0, 43.1 and 43.6 kg, P = 0.02, respectively) and peak milk, third lactation (50.8, 56.1, 59.1, 59.9 and 60.7 kg, P = 0.02, respectively). In conclusion, vitamin supplementation in low 25%, AVG, high 25% and high 5% vitamin supplementation significantly (P < 0.05) increased productive and reproductive dairy cow parameters versus the 2001 NRC, AVG versus low 25%, high 25% versus AVG and high 5% versus high 25% supplementation. Table 1 (Abstr. 334). Lactation for 658-kg cow BW
Vitamin1Unit/hd/dNRCLow 25%AVGHigh 25%High 10%High 5%
AIU72,53190,000174,375258,750297,563327,319
D3IU030,00038,77945,00051,75056,925
EIU4351,0001,7502,0122,5613,157
Riboflavinmg005001,0001,1501,265
Niacinmg003,0006,0006,9007,590
Cholinemg0010,00015,00017,25018,975
Thiaminemg000120138152
Pyridoxinemg000667683
Biotinmg000180207228
B12mg000135155171
Pantothenic acidmg000240276304
Folicmg000201231254
1B vitamins were coated.

Key Words: dairy cow, vitamin supplementation, performance