Productivity of lactating dairy cows fed diets with teff ...

RESULTS Productivity of lactating dairy cows fed diets with teff hay as the sole forage B. A. Saylor *, D. H. Min † , and B. J. Bradford * *Department of Animal Sciences and Industry, Kansas State University † Department of Agronomy, Kansas State University OBJECTIVE To assess the productivity of high producing dairy cows fed diets with teff hay as the sole forage CONCLUSIONS • Teff grass has potential to be used as an alternative forage source for lactating dairy cows without negatively impacting DMI or milk and component production • A high-NDF forage like teff can be incorporated into the diet at a lower inclusion rate and, by filling space with additional concentrate, diet fermentability and rumen stability can be maintained • Feeding teff has potential to improve the resilience of the dairy industry to future water shortages INTRODUCTION • Declining groundwater supplies is one of the most pressing issues facing the dairy industry today EXPERIMENTAL DESIGN • Nine multiparous Holstein cows (185 ± 31 DIM) from the Kansas State University Dairy Cattle Teaching and Research Unit were used in a replicated 3 × 3 Latin square design • Treatment periods were 18 d, with the final 4 d used for data and sample collection • Treatment diets were TEFF-A, TEFF- B and CON (refer to Table 1) STUDY DIETS % of DM TEFF – A TEFF – B CON Teff hay 29.6 27.3 - Corn silage - - 23.9 Alfalfa hay - - 19.4 Prairie hay - - 1.6 Wet corn gluten feed 23.2 23.2 23.2 TEFF grain mix 36.7 36.7 - CON grain mix - - 27.9 Ground corn 7.0 7.1 - Soybean hulls - 2.2 - Cottonseed 3.5 3.5 4.0 Water, % as-fed 26.2 26.2 - Dry matter, % as-fed 60.0 60.0 59.6 Crude protein 17.1 17.1 16.8 Neutral detergent fiber 33.6 33.6 31.7 Forage NDF 18.1 16.6 18.3 Acid detergent fiber 16.7 17.0 18.6 Non-fiber carbohydrate 35.3 35.5 36.7 Ether extract 3.7 3.7 4.1 Ash 8.8 8.7 9.1 uNDF 240 5.8 5.5 9.0 Dry matter intake, kg/d Milk yield, kg/d Milk fat % Milk protein % a,b Means with different superscripts are significantly different (P < 0.05) Apparent Total-Tract Digestibility, % • Alternative forage crops with improved water-efficiency have potential to improve the sustainability of the dairy industry in drought-stressed regions • Teff is a warm-season annual grass (C4 physiology) native to Ethiopia that is well-adapted to arid conditions Table 1 Table 2 Nutrient composition of teff hay used in experiment Nutrients, % of DM % of DM Std. Dev. DM, % as-fed 92.3 0.3 CP 12.9 0.4 aNDFom 1 56.1 1.9 ADF 29.8 0.8 NFC 12.2 2.1 EE 1.9 0.1 Ash 8.0 0.3 uNDF 2 12.4 5.5 1 Amylase-treated, ash-free neutral detergent fiber 2 240 h undigested neutral detergent fiber 40.6 41.0 40.4 0 10 20 30 40 50 60 TEFF-A TEFF-B CON P = 0.65 28.0 28.4 28.0 0 10 20 30 40 50 TEFF-A TEFF-B CON P = 0.76 3.83 3.84 4.03 3.00 3.50 4.00 4.50 TEFF-A TEFF-B CON P = 0.19 3.14 3.18 3.07 2.50 2.70 2.90 3.10 3.30 3.50 TEFF-A TEFF-B CON P < 0.001 a a b 65.4 52.2 67.7 54.9 64.3 50.0 0 20 40 60 80 100 Dry Matter Neutral Detergent Fiber TEFF-A TEFF-B CON P = 0.47 P = 0.58 ACKNOWLEDGEMENTS Contribution no. 17-332-J from the Kansas Agricultural Experiment Station. Partial funding for this work was provided from the Kansas EPSCoR Program supported by National Science Foundation Grant No. EPS-0903806 and the State of Kansas Saylor, B.A., D.H. Min, and B.J. Bradford. 2018. Productivity of lactating dairy cows fed diets with teff hay as the sole forage. J Dairy Sci. 101:5984–90.

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Page 1: Productivity of lactating dairy cows fed diets with teff ...

RESULTS

Productivity of lactating dairy cows fed diets with teff hay as the sole forageB. A. Saylor *, D. H. Min †, and B. J. Bradford *

*Department of Animal Sciences and Industry, Kansas State University†Department of Agronomy, Kansas State University

OBJECTIVETo assess the productivity of high producing dairy cows fed diets with teff hay as the sole forage

CONCLUSIONS• Teff grass has potential to be used as an alternative

forage source for lactating dairy cows without negatively impacting DMI or milk and component production

• A high-NDF forage like teff can be incorporated into the diet at a lower inclusion rate and, by filling space with additional concentrate, diet fermentability and rumen stability can be maintained

• Feeding teff has potential to improve the resilience of the dairy industry to future water shortages

INTRODUCTION• Declining groundwater supplies is one of the most pressing

issues facing the dairy industry today

EXPERIMENTAL DESIGN• Nine multiparous Holstein cows (185

± 31 DIM) from the Kansas State University Dairy Cattle Teaching and Research Unit were used in a replicated 3 × 3 Latin square design

• Treatment periods were 18 d, with the final 4 d used for data and sample collection

• Treatment diets were TEFF-A, TEFF-B and CON (refer to Table 1)

STUDY DIETS

% of DM TEFF – A TEFF – B CONTeff hay 29.6 27.3 -Corn silage - - 23.9Alfalfa hay - - 19.4Prairie hay - - 1.6Wet corn gluten feed 23.2 23.2 23.2TEFF grain mix 36.7 36.7 -CON grain mix - - 27.9Ground corn 7.0 7.1 -Soybean hulls - 2.2 -Cottonseed 3.5 3.5 4.0Water, % as-fed 26.2 26.2 -Dry matter, % as-fed 60.0 60.0 59.6Crude protein 17.1 17.1 16.8Neutral detergent fiber 33.6 33.6 31.7Forage NDF 18.1 16.6 18.3Acid detergent fiber 16.7 17.0 18.6Non-fiber carbohydrate 35.3 35.5 36.7Ether extract 3.7 3.7 4.1Ash 8.8 8.7 9.1uNDF240 5.8 5.5 9.0

Dry matter intake, kg/d Milk yield, kg/d

Milk fat % Milk protein %

a,bMeans with different superscripts are significantly different (P < 0.05)

Apparent Total-Tract Digestibility, %

• Alternative forage crops with improved water-efficiency have potential to improve the sustainability of the dairy industry in drought-stressed regions

• Teff is a warm-season annual grass (C4 physiology) native to Ethiopia that is well-adapted to arid conditions

Table 1

Table 2 Nutrient composition of teff hay used in experimentNutrients, % of DM % of DM Std. Dev.DM, % as-fed 92.3 0.3CP 12.9 0.4aNDFom1 56.1 1.9ADF 29.8 0.8NFC 12.2 2.1EE 1.9 0.1Ash 8.0 0.3uNDF2 12.4 5.51Amylase-treated, ash-free neutral detergent fiber2240 h undigested neutral detergent fiber

40.6 41.0 40.4

0102030405060

TEFF-A TEFF-B CON

P = 0.65

28.0 28.4 28.0

TEFF-A TEFF-B CON

P = 0.76

3.83 3.84 4.03

3.00

3.50

4.00

4.50

TEFF-A TEFF-B CON

P = 0.19

3.14 3.18 3.07

2.50

2.70

2.90

3.10

3.30

3.50

TEFF-A TEFF-B CON

P < 0.001a a

65.452.2

67.754.964.3

50.0

100

Dry Matter Neutral Detergent FiberTEFF-A TEFF-B CON

P = 0.47P = 0.58

ACKNOWLEDGEMENTSContribution no. 17-332-J from the Kansas Agricultural Experiment Station. Partial funding for this work was provided from the Kansas

EPSCoR Program supported by National Science Foundation Grant No. EPS-0903806 and the State of Kansas

Saylor, B.A., D.H. Min, and B.J. Bradford. 2018. Productivity of lactating dairy cows fed diets with teff hay as the sole forage. J Dairy Sci. 101:5984–90.