Oral and Poster Abstracts

extract (Mycosorb ® , Alltech Inc.) on milk quality (SCC, % fat &
protein) and quantity.
Materials and methods: The study was conducted on dairy cow herds
where visual observations indicated the presence of mycotoxin
contaminated forage. The study was conducted on 2 dairy farms. The total
milk production and milk composition was recorded for the total trial
period. The trial was conducted near Rome, Italy. The trial was done on a
“before and after” basis with production figures being compared before
and after the inclusion of Mycosorb Farm Pak. (including Mycosorb at
20% on a carrier). Mycosorb Farm Pak was distributed at 100 g/head/days
for the first 10 days and 50 g/head/day after until the end of the trial.
Results: FARM 1The trial was conducted with 83 lactating Holstein-
Friesian cows. The basal diet consisted of corn silage, Ryegrass hay,
alfalfa hay, maize meal, feed concentrate (31% crude protein), soybean
meal and peas. The total milk production and milk composition was
recorded for 5 months: first 2 month without Mycosorb and
consecutive 3 months with Mycosorb in the diet. Mycosorb inclusion
increased milk yield by 1.5 l/h/d while stage of lactation remained
identical; protein percentage (3.36% vs 3.41%) and fat percentage
(3.71% vs 3.97%) while somatic cell count (SCC) was reduced (529 vs
196, x1000 cells/ml). FARM 2The trial was conducted with 74
lactating Holstein-Friesian cows. The basal diet consisted of corn
silage, ryegrass hay, alfalfa hay, feed concentrate (21% crude protein).
The total milk production and milk composition was recorded for 12
months: 3 months without Mycosorb followed by 3 months with
Mycosorb in the diet and then again 3 months without Mycosorb. With
Mycosorb in the diet, SCC decreased (430 vs 288, x1000 cells/ml) and
increased again (288 vs 598, x1000 cells/ml) after the removal of
Mycosorb. Mycosorb inclusion increased milk yield by 2 l/h/d without
change in stage of lactation at herd level.
Conclusions: In conclusion, the inclusion of Mycosorb into the diet
can be used to alleviate mycotoxins negative impact on productive
performance and milk composition.
Key words: dairy cows, milk production, mycotoxins
466 Effects of Increasing Prepartum Dietary Protein Level Using
Poultry by-product Meal on Productive Performance and
Health of Multiparous Holstein Dairy Cows
F. Kafilzadeh 1 , M. Yazdi 1 , H. Amanloo 2
1 Razi University, Department of Animal Science, Kermanshah, Iran
2 University of Zanjan, Department of Animal Science, Zanjan, Iran
The effects of two levels of crude protein (CP) using poultry by-product
meal fed during late gestation on the performance, blood metabolites,
some reproductive parameters and colostrum composition of Holstein
cows was studied. Sixteen multiparous cows 26±6 d before calving were
assigned to one of the two diets in a randomized block design to evaluate
the effects of two isocaloric diets containing either 14 or 16 % crude
protein. Postpartum diet was similar in both groups through wk 3 of
lactation. Yields of milk, protein, lactose, fat, and SNF were not affected
by prepartum crude protein level. Colostrum composition (fat%, CP%
and Total solids%) blood metabolites (Ca, Glucose, Total protein,
Albumin, Globulin, Urea N and Cholesterol), some of the reproductive
performance indexes (Pregnancy duration, Days open, First AI, service
per conception, First service Conception rate%, and Pregnancy rate%),
and disease incidence were not influenced by prepartum crude protein
level. Colostrum fat percent was significantly affected (P