Microbial protein net synthesis in sheep fed
meadow hay supplemented
with different source and level of fat

Szumacher-Strabel, M.

doi:10.22358/jafs/69313/1998

Cited by 4 publications

(7 citation statements)

References 20 publications

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“…Compared with previous experiments (Szumacher-Strabel, 1998), where sheep were fed hay diets, NM production in sheep fed concentrate-based diets tended to be slightly higher, but the results of the previous study, when hay diets were fed, were more uniform. Similarly, in the experiment of Perez et al (1997) when sheep were fed diets consisting of rations with two forage: concentrate ratios (low concentrate-LC and high concentrate-HC) urinary excretion of purine derivatives and microbial yield were higher in animals offered HC than in those that were offered LC.…”

Section: Resultscontrasting

confidence: 90%

“…The obtained results are similar when compared with previous paper (Szumacher-Strabel, 1998). The results of these two studies indicate that addition of fat to sheep rations does not influence MN production to a significant degree.…”

Section: Resultssupporting

confidence: 88%

“…As expressed in the previous study, the composition of the basal diet also may influence how a fat source affects ruminal fermentation (Szumacher-Strabel, 1998). According to Jenkins (1993) fats that normally inhibit fermentation and digestion often cause less inhibition when the hay content of the basal diet is high.…”

Section: Resultsmentioning

confidence: 78%

“…Sheep received diets consisting of 40% meadow hay, chopped into 5 cm and 60% concentrate, supplemented with 4, 8 and 10%) of fat on dry matter basis. The current study is a continuation of previous research based on hay diets (Szumacher-Strabel, 1998). Three experiments were carried out: the 1 st experiment with added rape seed oil (RSO), the 2 nd with linseed oil (LSO), and the 3 rd with tallow (TAL).…”

Section: Animals and Dietsmentioning

confidence: 98%

“…Samples of rumen fluid and urine were collected and analyzed as described in a previous paper (Szumacher-Strabel, 1998).…”

Section: Sample Collection and Analysismentioning

confidence: 99%

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Microbial protein net synthesis in sheep fed hay-concentrate diets supplemented with different source and level of fat

Szumacher-Strabel¹

1998

J. Anim. Feed Sci.

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Three experiments in a 4 x 4 Latin square design were carried out on four rams fitted with rumen cannulas to investigate the effect of varying sources and levels of fat addition on microbial protein net synthesis (MN) in sheep fed a concentrate-based diet (60% of concentrate and 40% of meadow hay). In the 1 st experiment addition of rape seed oil (RSO) was tested, linseed oil (LSO) was added in the 2 nd , and tallow (TAL) in the in 3 rd experiment. Treatments in all experiments were similar: a control group without fat addition and experimental groups with 4, 8 and 10% of fat in DM of the diet. Microbial production in the rumen, purine derivatives in urine, ruminal ammonia, pH, fatty acids in the rumen were measured. In all cases fat addition resulted in decreased MN, however, 8% fat supplementation had the least deleterious effect on MN production. Fat addition significantly affected purine derivatives excretion. LSO as the supplemental fat led to a decrease in N ammonia concentration from 7.8 mmol/L in the control group to 6.39 mmol/L in the group that received 8% LSO, whereas a significant increase to 9.00 mmol/L was observed when 10% LSO in DM was fed. Ruminal fluid pH was not altered by treatments. In all of the experiments, the increased fat content in the diets decreased the molar percentage of acetic acid. Supplementation of the diet with LSO and TAL resulted in an increase of the propionic acid level (P<0.05).

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