Effect of feeding yeast culture on ruminal fermentation and blood indicators of Holstein dairy cows

Abstract

The experiment was conducted to evaluate the effect of yeast culture (Saccharomyces cerevisiae) supplementation on ruminal fermentation in 20 Holstein dairy cows divided into control and experimental groups, each group of 10 cows. The animals received a diet based on maize silage (19 kg), alfalfa silage (15 kg), meadow hay (1.5 kg), extracted rapeseed meal (1 kg) and concentrate mixture (9.5 kg). The diets were fed as a total mixed ration. ) was added to the concentrate mixture in the ration fed to the experimental group of animals. The addition of yeast culture significantly (P < 0.01) increased ruminal pH but had no positive effects on the increased production of volatile fatty acids. The supplementation of yeast culture significantly (P < 0.01) increased numbers of protozoa in the rumen of dairy cows of the experimental group (361.3 ± 18.315) compared to the control group (308.3 ± 37.505). The addition of yeast culture significantly (P < 0.01) increased concentration of serum glucose, calcium, phosphorus, copper, zinc, magnesium and AST (P < 0.05). As compared to the control group (4.948 ± 0.0384 mmol·l -1 ), the level of urea in the blood serum was significantly decreased (P < 0.01) in the experimental group of cows.Our results show that the supplementation of Saccharomyces cerevisiae culture at recommended doses enhances ruminal fermentation which may have a positive effect on milk production and health status of Holstein dairy cows. Saccharomyces cerevisiae, cows, rumen fluid, blood serum indicatorsYeasts and yeast cultures are frequently used as additives in diets of dairy cows at present. They have a positive influence on fermentation in the rumen, which helps to improve production health and productivity of animals.Results from previous studies on the effect of yeasts on ruminal fermentation and productivity of dairy cows are often ambiguous. The most cited benefit of yeast cultures on ruminal digestion is support of the growth and activity of anaerobic, namely cellulolytic bacteria. Yeasts would utilize residual oxygen introduced into the rumen with feeds, thus contributing to maintain anaerobic environment (Calsamiglia et al. 2006). Moreover, by degrading lyotropic carbohydrates in the rumen, yeast cultures regulate the rate of fermentation, and also by stimulation of lactate-utilizing bacteria yeasts facilitate stabilization of the rumen pH and mitigate its frequent oscillations during the day (Williams et al. 1991). Stable rumen environment is a key factor for achieving optimum milk yields and a good health of animals. However, some authors did not observe any beneficial effects of yeast cultures on dry matter intake or on the milk production and its composition in dairy cows (Cooke et al. 2007). Neither the positive influence of yeast on the digestibility of feeds in the rumen was unambiguously corroborated.Recent studies indicate that yeasts produce also certain low-molecular peptides that simulate the activity of some bacteria species in the rumen (Denev et al. 2007). However, to achieve ...

Blood biochemical changes and thyroid hormones pattern of Barki ewes as affected by biological supplementation under semi-arid conditions of Egypt

“…Similar results were obtained in lambs Salem, 2015 andBeigh et al, 2017), cattle (Hristov et al, 1999) and buffaloes (El-Kady et al, 2006) supplemented with exogenous enzymes. Moreover, Dolezal et al (2011) found lower concentration in BUN of cows in response to biological supplementation which suggested as an indicator of better nitrogen metabolism and utilization of protein. In contrast, Abdel Rahman et al (2012) and Mousa et al (2012) found that feeding diets treated with biological additives resulted in an increase of BUN concentration in sheep.…”

Metabolic and Ruminal Fluid Markers of Dairy Cows Supplemented with a Combination of Yeast Culture and Hydrolyzed Yeast

“…Dolezal et al [12] attribute the low blood urea in yeast supplemented animals to a by-pass protein effect in the rumen or a lower concentration of ruminal degradable protein.…”

Besi sığırı rasyonlarına maya kültürü ilavesinin besi performansı ile bazı rumen ve kan parametreleri üzerine etkisi

“…Yapılan bazı çalışmalarda da (38,40) canlı maya kültürü ilavesi ile serum glikoz seviyesinin yükseldiği başka bir çalışmada (41) ise azaldığı rapor edilmiştir. Süt ineklerinde düşük kan üre azotu konsantrasyonu ya rasyondaki yüksek bypass protein içeriği yada rumende düşük değerde RDP'li bir rasyon bulunması durumunda gözlenir (15).…”

“…Bazı çalışma-larda, ruminant rasyonlarına canlı maya kültürü ilavesinin kuru madde tüketimini, günlük canlı ağırlık artışını ve yemden yararlanma oranını artırdığı bildirilmiştir (2,26,31). Canlı maya kültürü ilavesiyle birlikte rumen pH değerinin yükseldiği ve fermantasyon için rumende optimal koşulların sağlandığı bildirilmiştir (8,15). Canlı maya kültürü ilavesinin rumende asetik asit ve bütirik asit miktarlarını artırdığı, propiyonik asit miktarını azalttığı saptanmıştır (18,29,32).…”