Effects of addition of nutritionally improved straw in dairy cow diets at 2 starch levels

• Published in: Journal of dairy science 2020-11, Vol.103 (11), p.10233-10244
• Main Authors: Hanlon, M.E., Moorby, J.M., McConochie, H.R., Foskolos, A.
• Format: Article
• Language: English
• Subjects: Animal Feed; Animals; Cattle - physiology; Diet - veterinary; Dietary Fiber - administration & dosage; Digestion - physiology; Eating; Female; Lactation - physiology; Milk - chemistry; Milk - metabolism; Milk Proteins - analysis; neutral detergent fiber; Nitrogen - metabolism; nutritionally improved straw; Nutritive Value - physiology; Rumen - metabolism; starch; Starch - administration & dosage; Triticum - metabolism
• ISSN: 0022-0302; 1525-3198
• DOI: 10.3168/jds.2020-18360

The objective of this experiment was to explore the effects of different dietary neutral detergent fiber sources within diets of high-producing dairy cattle with low or high starch concentrations on milk yield and composition, dry matter intake (DMI), total-tract digestibility, nitrogen (N) partitioning, and rumen function and health. Holstein-Friesian cows in early- to mid-lactation (n = 12; 666 ± 67 kg of body weight at the start of the experiment) and dry cannulated Holstein-Frisian cows (n = 4; 878 ± 67 kg of body weight at the start of the experiment) were used in multiple 4 × 4 Latin square design experiment and were offered 4 different diets. The treatments were 50:50 forage-to-concentrate diets within a total mixed ration (TMR) consisting, on a dry matter (DM) basis, of 42.4% grass silage as the main forage, 7.6% chopped untreated wheat straw, or sodium hydroxide (NaOH) wheat straw pellets, known as nutritionally improved straw (NIS), and 50.0% of 1 of 2 different concentrates with low or high starch level (TMR starch level of 16.0 vs. 24.0% of DM, respectively). Four experimental periods were used, each consisting of a 21-d adaptation period and 7 d of sampling. Dry matter intake and milk yield were both affected by the type of straw included in the diet. A 1.6 kg/d higher DMI was seen when NIS was fed compared with untreated straw, resulting in a 1.7 kg/d higher milk yield. Milk protein concentration was affected by straw type and starch level, and it was 4 and 3% higher when NIS and high-starch diets were fed, respectively. Diets with NIS were more positively effective when fed with low levels of starch. These results illustrate that feeding NIS to high-producing lactating dairy cows fed low or high starch concentrations has a positive effect on performance.