Productive and reproductive performance of dairy cows fed corn silage without or with some microbial additives

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Abstract: The main objective of this study was to investigate the effect of using corn silage (CS) in cow's rations of without or with dry live bacteria (DLB) or dry live yeast (DLY) on productive and reproductive performance of cow's. Thirty pregnant Friesian cows were used in this study. They were divided into 6 similar groups, in parity (3rd season and 450 kg live body. The experimental period lasted from 8 weeks before the predicted date of calving and continued for 120 days post calving. The animals were fed according to NRC (1988) recommendations. The sex groups were assigned at rations to receive the following rations:R1: 60% CFM+ 20% CS + 20% (RS) and was considered as the control ration, R2: 60% CFM+ 20% CS + 20% RS + 2 g (DLB), R3: 60% CFM+ 20% CS + 20%RS + 10 g (DLY), R4: 40% CFM+ 40 % CS + 20% RS + 2 g DLB, R5: 40% CFM+ 40 % CS + 20% RS + 4 g DLB.R6: 40% CFM+ 40 % CS + 20% RS + 10 g DLY. Results showed that nutrients digestibility were significantly (P<0.05) improved by adding CS to the rations with bacterial or yeast additives especially with R6 followed by R5, R4, R3, R2 compared with R1. Similar trend was occurred with TDN, while DCP values were significantly (P<0.05) increased for R2 and R3, but it decreased with high CS rations. Within the same level of CS both additives decreased (P<0.05) ruminal pH among the different sampling times. Ruminal ammonia-N concentrations were significantly decreased (P<0.05) with increasing the level of CS (R4, R5 and R6), while the addition of DBL or DLY significantly (P<0.05) increased NH3-N concentrations. Increasing level of corn silage improved milk yield at constant level of the DBL or DLY. The addition of DBL or DLY to corn silage rations increased milk yield especially R6. The highest average milk yield were recorded with R6 followed by R5, while R1 recorded the lowest one. Fat and protein% contents were the highest for groups R5 and R6. Milk total solids% increased by both additives. No significant differences were observed in fatty acids of milk fat by feeding CS ration without additives R1 or with DLB or DLY supplementation in (R2 to R6) compared to control. All groups showed nearly similar feed conversion as the amount of TDN required to produce one Kg 4% FCM. The differences were not significant among treatments. Reproductive performance in terms of the first ovarian cycle length, return involution period (UIP), first ovulation (PPOI), first estrus (PPEI), first service (PPSI), service period (SP), number of service per conception (NSPC) of cows fed R5 and R6 were improved compared to those fed the other rations. From economical point of view the use of R6 (40% CS plus 10 g east/cow/day) in lactating cows rations could be recommended to improve milk production, fed conversion and reproductive performance.
Keywords, Cows, Probiotics, yeast, digestibility, productive / reproductive performance

Publication year

2011

Pages

393-408

Availability location

معهد بحوث الانتاج الحيوانى-شارع نادى الصيد- الدقى- الجيزة

Availability number

Organization Name

Animal Production Research Institute (APRI)

serial title

Egyptian Journal Nutrition and feeds

ISSN