Increasing home-grown forage consumption and profit in non-irrigated dairy systems. 2. Forage harvested
J. Tharmaraj A , D. F. Chapman A B , J. Hill C , J. L. Jacobs D and B. R. Cullen A EA Department of Agriculture and Food Systems, Melbourne School of Land and Environment, University of Melbourne, Parkville, Vic. 3010, Australia.
B DairyNZ, PO Box 160, Lincoln University, 7647, New Zealand.
C Ternes Agricultural Consulting, Upwey, Vic. 3158, Australia.
D Department of Primary Industries, 78 Henna Street, Warrnambool, Vic. 3280, Australia.
E Corresponding author. Email: bcullen@unimelb.edu.au
Animal Production Science 54(3) 234-246 https://doi.org/10.1071/AN12296
Submitted: 22 August 2012 Accepted: 11 April 2013 Published: 16 January 2014
Abstract
A dairy farmlet experiment was conducted at Terang in south-west Victoria, Australia, over 4 years to test the hypothesis that a 30% increase in forage harvested per ha could be achieved in a production system that incorporated a range of Complementary Forages with perennial ryegrass (CF) compared with a well managed perennial ryegrass-only farmlet (‘Ryegrass Max’, RM). The CF farmlet included perennial ryegrass pasture (44% of the farmlet area on average over 4 years), but also incorporated oversowing perennial ryegrass with short-term ryegrasses (average 16% of farmlet area) to increase winter growth, tall fescue-based pasture (average 20% of farmlet area) to increase production in the late spring–summer period, a double cropping rotation (15% of farmlet area) based on winter cereal for silage production followed by summer brassica crops for grazing, and summer crops used in the pasture renovation process (average 5% of farmlet area). The RM and CF farmlets were stocked at 2.2 and 2.82 June-calving cows/ha, respectively and average annual nitrogen (N) fertiliser application rates (pasture only) were 141 and 153 kg N/ha, respectively. The total amount of forage harvested per year was generally less than predicted from pre-experimental modelling of both farmlets. However, the proposed target of a 30% increase in home-grown forage harvest per ha in the CF system compared with RM was exceeded in 2005–06 (+33%), with 21, 16 and 11% higher forage harvest achieved in CF in 2006–07, 2007–08 and 2008–09, respectively (average for all 4 years = 20%). Annual forage harvested in RM ranged between 6.5 and 8.9 t DM/ha compared with 7.9–10.3 t DM/ha in CF. Approximately two-thirds of the increased forage harvest in CF came from higher rates of pasture consumption per ha and one-third from the double cropping component of the system, although the performance of the double crop (mean annual production of 11.5 t DM/ha) was well below the expected 20 t DM/ha based on pre-experimental modelling. The higher per-hectare pasture harvest rates in CF were primarily due to increased perennial ryegrass pasture consumption achieved through higher stocking rates and efficient responses to higher N inputs from both higher fertiliser rates and additional supplementary feeding. In CF, the DM harvested from pastures oversown with short-term ryegrasses was lower than perennial ryegrass, while tall fescue-based pastures were similar to perennial ryegrass. Poor spring rainfall in 2006–07 and 2008–09 likely contributed to the lower than expected DM yields of tall fescue-based pasture and the summer crops within the double cropping component. Home-grown forage harvest rates can be increased by 11–33% above what is currently achieved by best industry practice with perennial ryegrass-only pastures using complementary forages but perennial ryegrass will remain a key component of the forage base for dairy production in southern Australia.
References
Armstrong DP, Tarrant KA, Ho CKM, Malcolm LR, Wales WJ (2010) Evaluating development options for a rain-fed dairy farm in Gippsland. Animal Production Science 50, 363–370.| Evaluating development options for a rain-fed dairy farm in Gippsland.Crossref | GoogleScholarGoogle Scholar |
Castillo AR, Kebreab E, Beever DE, France J (2000) A review of efficiency of nitrogen utilisation in lactating dairy cows and its relationship with environmental pollution. Journal of Animal and Feed Sciences 9, 1–32.
Chapman DF, Kenny SN, Beca D, Johnson IR (2008) Pasture and crop options for non-irrigated dairy farms in southern Australia. 2. Inter-annual variation in forage supply, and business risk. Agricultural Systems 97, 126–138.
| Pasture and crop options for non-irrigated dairy farms in southern Australia. 2. Inter-annual variation in forage supply, and business risk.Crossref | GoogleScholarGoogle Scholar |
Chapman DF, Kenny SN, Lane N (2011) Pasture and crop options for non-irrigated dairy farms in southern Australia. 3. Estimated economic value of additional home grown feed. Agricultural Systems 104, 589–599.
| Pasture and crop options for non-irrigated dairy farms in southern Australia. 3. Estimated economic value of additional home grown feed.Crossref | GoogleScholarGoogle Scholar |
Chapman DF, Tharmaraj J, Agnusdei M, Hill J (2012) Regrowth dynamics and grazing decision rules: further analysis for dairy production systems based on perennial ryegrass (Lolium perenne L.) pastures. Grass and Forage Science 67, 77–95.
| Regrowth dynamics and grazing decision rules: further analysis for dairy production systems based on perennial ryegrass (Lolium perenne L.) pastures.Crossref | GoogleScholarGoogle Scholar |
Chapman DF, Hill J, Tharmaraj J, Beca D, Kenny SN, Jacobs JL (2014) Increasing home-grown forage consumption and profit in non-irrigated dairy systems. 1. Rationale, systems design and management. Animal Production Science 54, 221–233.
| Increasing home-grown forage consumption and profit in non-irrigated dairy systems. 1. Rationale, systems design and management.Crossref | GoogleScholarGoogle Scholar |
Doyle PT, Stockdale CR, Lawson AW, Cohen DC (2000) ‘Pastures for dairy production in Victoria.’ (Department of Natural Resources and Environment: Kyabram)
Eckard RJ (1998) ‘A critical review of research on the nitrogen nutrition of dairy pastures in Victoria.’ (University of Melbourne and Agriculture Victoria: Melbourne) Available at http://www.nitrogen.unimelb.edu.au [Verified 6 February 2013]
Gourley CJP, Dougherty WJ, Weaver DM, Aarons SR, Awty IM, Gibson DM, Hannah MC, Smith AP, Peverill KI (2012a) Farm-scale nitrogen, phosphorus, potassium and sulphur balances and use efficiencies on Australian dairy farms. Animal Production Science 52, 929–944.
| Farm-scale nitrogen, phosphorus, potassium and sulphur balances and use efficiencies on Australian dairy farms.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BC38Xht1GrsL7O&md5=5d223acf5b5c818b5387c446863e0c7fCAS |
Gourley CJP, Aarons SR, Powell JM (2012b) Nitrogen use efficiency and manure management practices in contrasting dairy production systems. Agriculture, Ecosystems & Environment 147, 73–81.
| Nitrogen use efficiency and manure management practices in contrasting dairy production systems.Crossref | GoogleScholarGoogle Scholar |
Hill J, Chapman DF, Tharmaraj J, Jacobs JL, Cullen BR (2014) Increasing home-grown forage consumption and profit in non-irrigated dairy systems. 3. Intake, milk production and composition, bodyweight and body condition score. Animal Production Science 54, 247–255.
| Increasing home-grown forage consumption and profit in non-irrigated dairy systems. 3. Intake, milk production and composition, bodyweight and body condition score.Crossref | GoogleScholarGoogle Scholar |
Isbell R (2002) ‘The Australian soil classification.’ Revised edn. (CSIRO Publishing: Melbourne)
Jacobs JL, Ward GN (2011) Effects of nitrogen application on dry matter yields, nutritive characteristics and mineral content of summer-active forage crops in southern Australia. Animal Production Science 51, 77–86.
| Effects of nitrogen application on dry matter yields, nutritive characteristics and mineral content of summer-active forage crops in southern Australia.Crossref | GoogleScholarGoogle Scholar |
Jacobs JL, McKenzie FR, Rigby SE, Kearney GA (1998) Effect of nitrogen fertiliser application and length of lock up on dairy pasture dry matter yield and quality for silage in south-western Victoria. Australian Journal of Experimental Agriculture 38, 219–226.
| Effect of nitrogen fertiliser application and length of lock up on dairy pasture dry matter yield and quality for silage in south-western Victoria.Crossref | GoogleScholarGoogle Scholar |
Jacobs JL, Ward GN, McDowell AM, Kearney GA (2001) A survey on the effect of establishment techniques, crop management, moisture availability and soil type on turnip dry matter yields and nutritive characteristics in western Victoria. Australian Journal of Experimental Agriculture 41, 743–751.
| A survey on the effect of establishment techniques, crop management, moisture availability and soil type on turnip dry matter yields and nutritive characteristics in western Victoria.Crossref | GoogleScholarGoogle Scholar |
Jacobs JL, Hill J, Jenkin T (2009a) Effect of stage of growth and silage additives on whole crop cereal silage nutritive and fermentation characteristics. Animal Production Science 49, 595–607.
| Effect of stage of growth and silage additives on whole crop cereal silage nutritive and fermentation characteristics.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1MXntVGktbw%3D&md5=af5cdd3c530858681ea2f50555d10e0dCAS |
Jacobs JL, Hill J, Jenkin T (2009b) Effect of different grazing strategies on DM yields and nutritive characteristics of whole crop cereals. Animal Production Science 49, 608–618.
| Effect of different grazing strategies on DM yields and nutritive characteristics of whole crop cereals.Crossref | GoogleScholarGoogle Scholar |
McGowan AA (1987) ‘Review of experiments with nitrogen fertiliser in Victoria.’ Research Report Series No. 54. (Department of Agriculture and Rural Affairs: Melbourne)
Mitchell G (1998) ‘Profitable pasture use: a key to cost-efficient dairying in South Australia.’ Bulletin 2/98, Primary Industries and Resources South Australia. (PIRSA: Adelaide)
Nie ZN, Chapman DF, Tharmaraj J, Clements R (2004) Effects of pasture species mixture, management, and environment on the productivity and persistence of dairy pastures in south-west Victoria. 2. Plant population density and persistence. Australian Journal of Agricultural Research 55, 637–643.
| Effects of pasture species mixture, management, and environment on the productivity and persistence of dairy pastures in south-west Victoria. 2. Plant population density and persistence.Crossref | GoogleScholarGoogle Scholar |
O’Brien G (Ed.) (1994) ‘Pasture management for dairy farmers. Gippsland and Western Victoria.’ (Department of Agriculture Victoria: East Melbourne)
Pacheco D, Waghorn GC (2008) Dietary nitrogen – definitions, digestion, excretion and consequences of excess for grazing ruminants. Proceedings of the New Zealand Grassland Association 70, 107–116.
Rogers JA, Davies GE (1973) Growth and chemical composition of four grass species in relation to soil moisture and aeration factors. Journal of Ecology 61, 455–472.
| Growth and chemical composition of four grass species in relation to soil moisture and aeration factors.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DyaE2cXisFOj&md5=3aa564aa8496d462761585282b9ecd19CAS |
Stockdale CR, King KR (1983) A comparison of two techniques used to estimate the herbage intake of lactating cows in a grazing experiment. The Journal of Agricultural Science 100, 227–230.
| A comparison of two techniques used to estimate the herbage intake of lactating cows in a grazing experiment.Crossref | GoogleScholarGoogle Scholar | [Cambridge]
Tharmaraj J, Chapman DF, Nie ZN, Lane AP (2008) Herbage accumulation, botanical composition, and nutritive value of five pasture types for dairy production in southern Australia. Australian Journal of Agricultural Research 59, 127–138.
| Herbage accumulation, botanical composition, and nutritive value of five pasture types for dairy production in southern Australia.Crossref | GoogleScholarGoogle Scholar |
Verbyla AP, Cullis BR, Kenward MG, Welham SJ (1999) The analysis of designed experiments and longitudinal data by using smoothing splines (with discussion). Applied Statistics 48, 269–311.
| The analysis of designed experiments and longitudinal data by using smoothing splines (with discussion).Crossref | GoogleScholarGoogle Scholar |
Zadoks JC, Chang TT, Konzak CF (1974) A decimal code for the growth stages of cereals. Weed Research 14, 415–421.
| A decimal code for the growth stages of cereals.Crossref | GoogleScholarGoogle Scholar |
