Dietary protein level and corn processing method: Intake, digestibility, and feeding behavior of lactating dairy cows✰

Rafiee-Yarandi, Hassan; Alikhani, M.; Ghorbani, G.R.; Heydari, Mehdi; Rezamand, Pedram

doi:10.1016/j.livsci.2019.01.001

Cited by 7 publications

(7 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is possible that a shift in site of digestion of starch from the rumen to the intestine, and the elevation in ruminal pH, led to an increase in fiber digestion, and consequently DM and OM digestibility, in the present study. In contrast to our results, apparent total-tract starch digestibility was increased by steam flaking of corn in comparison with GC in other studies (Dhiman et al, 2002;Guyton et al, 2003;Rafiee-Yarandi et al, 2019a). Flake density in those experiments was lower (360 g/L) than in the current experiment (400 g/L), which decreased the starch digestibility of SFC in the current experiment in comparison with GC.…”

Section: Effects Of Sfc Versus Gccontrasting

confidence: 99%

“…Cows fed GC sorted against >8 mm particles 6 and 24 h after the morning feeding in comparison with cows fed SFC. In agreement with our results, Savari et al (2018) and Rafiee-Yarandi et al (2019a) showed that cows fed SFC sorted for particles on an 8-mm sieve more than cows fed GC.…”

Section: Effects Of Sfc Versus Gcsupporting

confidence: 92%

“…Similar to the current experiment, Harvatine et al (2002b) and Rafiee-Yarandi et al (2019a) reported that eating and rumination time (min/d) were not different between cows fed SFC or GC. Additionally, Beauchemin et al (2001) and Yang et al (2001) reported that processing of barley grain had no effect on eating time and eating time per kilogram of DMI.…”

Section: Effects Of Sfc Versus Gcsupporting

confidence: 82%

“…The lower MPS of GC compared with SFC caused the GC to almost entirely pass through the 8-mm sieve, resulting in greater mean PS of diets with SFC compared with GC. In agreement with these observations, Rafiee-Yarandi et al (2019a) and Savari et al (2018) reported that diets containing SFC had greater proportion of particles retained on an 8-mm sieve and greater MPS compared with GC diets. Guidelines for PS of TMR for high producing dairy cows suggest having 2 to 8% of the particles retained on the upper sieve, 30 to 40% on the middle and lower sieves, and no more than 20% on the pan (Humer et al, 2018).…”

Section: Effects Of Sfc Versus Gcsupporting

confidence: 68%

“…The effects of corn processing on DMI have been inconsistent; feeding SFC compared with GC decreased (Cooke et al, 2009;Savari et al, 2018;Rafiee-Yarandi et al, 2019a), increased (Yu et al, 1998;Bernard et al, 2004;Zhong et al, 2008), or had no effect (Cooke et al, 2008;Batistel et al, 2017) on DMI similar to the lack of treatment effect on DMI in the present study.…”

Section: Effects Of Sfc Versus Gcsupporting

confidence: 59%

See 4 more Smart Citations

Performance and feeding behavior of dairy cows fed high-concentrate diets containing steam-flaked or ground corn varying in particle size

Ahmadi

Ghorbani

Sadeghi-Sefidmazgi

et al. 2020

Journal of Dairy Science

View full text Add to dashboard Cite

Steam-flaked corn (SFC) and ground corn (GC) of different particle sizes were evaluated for their effects on dry matter intake (DMI), milk yield and components, chewing activity, ration sorting, ruminal fermentation, and digestibility in lactating dairy cows. Eight multiparous Holstein cows in mid-lactation (46.6 ± 3.5 kg/d milk production and 101 ± 10 d in milk) were used in a double 4 × 4 Latin square design with 21-d periods. Cows were fed diets (dry matter basis) containing 36.2% forage (alfalfa hay and corn silage), 37.4% corn grain, and 26.4% other ingredients. The corn grain was ground (coarse: 1.08 mm; medium: 0.84 mm; and fine: 0.73 mm) or steam-flaked (SFC; density = 0.40 kg/L). The dry matter proportion retained on an 8-mm sieve was greater for the SFC diet than for the GC diets. There were no treatment effects on DMI, milk yield, fat-corrected milk, energy-corrected milk, fat or lactose yield, protein or lactose content, or milk urea nitrogen concentration. However, digestibility of dry matter and organic matter were greater for fine GC and SFC than the other diets. In addition, cows fed SFC had lower total-tract starch digestibility than cows fed GC diets. Cows fed SFC tended to have lower propionate proportion (22.8 vs. 27.1 mM) and total volatile fatty acid concentration (88.6 vs. 99.8 mM) in ruminal fluid than those fed GC diets. Acetate and butyrate concentration, acetate to propionate ratio, and ruminal concentration of ammonia-nitrogen were not affected by treatments. Ruminal pH (6.46 vs. 6.01) as well as milk fat content (2.75 vs. 2.59%) and efficiencies (fatcorrected milk/DMI and energy-corrected milk/DMI) were greater for SFC than GC, regardless of its particle size. Milk fat content tended to increase linearly with increasing particle size of GC. Eating activity (min/d) tended to be less for SFC compared with GC, but rumination activity (min/d) and total chewing activity (min/d) were not affected by processing or particle size. The results of study indicate that, compared with GC, steam flaking of corn with 400 g/L density increased milk fat content and efficiency of high-producing dairy cows without any negative effect on milk yield. For GC, milk fat content tended to linearly increase and starch digestibility decreased linearly with increasing particle size.

show abstract

Section: Effects Of Sfc Versus Gccontrasting

confidence: 99%

Section: Effects Of Sfc Versus Gcsupporting

confidence: 92%