Effects of sowing rate and grazing management of forage rape (Brassica napus) on grazing behaviour and utilisation by dairy cattle
E. P. Stefanski A B C , S. C. Garcia B , S. R. Farina B , D. K. Y. Tan A and D. Tanner A BA Faculty of Agriculture, Food and Natural Resources, The University of Sydney, NSW 2006, Australia.
B MC Franklin Laboratory, Faculty of Veterinary Science, The University of Sydney, Camden, NSW 2570, Australia.
C Corresponding author. Email: este4931@uni.sydney.edu.au
Animal Production Science 50(6) 560-567 https://doi.org/10.1071/AN09206
Submitted: 15 December 2009 Accepted: 19 March 2010 Published: 11 June 2010
Abstract
The increase in total factor productivity in the Australian dairy industry over the last 10 years has been low (1.5%). To help address this issue, ‘FutureDairy’ is aiming to increase the production of home-grown feed currently achieved from pastures using a complementary forage-rotation (CFR) system. Forage rape (Brassica napus) is a key component of the CFR; however, it is a complex crop to manage and feed, and the interactions between the behaviour and grazing habits of dairy cattle are unknown. The present experiment investigated the effect of the sowing rate and grazing management of forage rape on the grazing behaviour and forage utilisation of lactating dairy cattle. A field experiment was established, with a forage rape crop planted at three different sowing rates of 2, 3.5 and 5 kg/ha. The crop was grazed using either a ‘multiple grazing’ system, where the forage rape was strip-grazed in a manner to promote regrowth to allow for regrazing, or a ‘take-all grazing’ system, where the forage rape was grazed once only after reaching maximum biomass. The grazing preferences of cows for the sowing rates during the grazing sessions were visually observed and recorded, and forage utilisation was determined from pre-grazing and post-grazing forage availability. Nitrogen (N) deposition from excreta was estimated using stocking density and time spent. Cattle preferred grazing the forage rape sown at 2 kg/ha, but this preference did not result in higher forage utilisation. Grazing method had no effect on forage utilisation or N deposition. Cows should be removed after ~80 min of grazing in a multiple grazing system to ensure future regrowth. Further work is necessary to fully investigate the effects of grazing method on forage utilisation and N deposition, and more accurate external devices and internal markers should be used in the future to provide better estimates of forage utilisation.
Additional keywords: N deposition.
Acknowledgements
The work reported is part of the FutureDairy2 project, primarily sponsored by Dairy Australia; Industry and Investment New South Wales; The University of Sydney and DeLaval. The authors would like to thank Dr Ajantha Horadagoda for her assistance with chemical analyses.
Andrieu B,
Hillier J, Birch C
(2006) Onset of sheath extension and duration of lamina extension are major determinants of the response of maize lamina length to plant density. Annals of Botany 98, 1005–1016.
| Crossref | GoogleScholarGoogle Scholar | PubMed |
[Verified 16 November 2009]
Cataldo DA,
Haroon M,
Schrader LE, Youngs VL
(1975) Rapid colorimetric determination of nitrate in plant tissue by nitration of salicylic acid. Communications in Soil Science and Plant Analysis 6, 71–80.
| Crossref | GoogleScholarGoogle Scholar |
CAS |
D’Antuono FL, Neri R
(1998) Characterisation and potential new uses of palm tree kale (Brassica oleracea L., ssp. acephala DC, var. sabellica L.). Acta Horticulturae 459, 97–104.
Fukumoto NM,
Damasceno JC,
Côrtes C,
Paine C,
Queiroz MFS,
Santos GT, Matsushita M
(2007) Use of n-alkanes to estimate intake and digestibility of signal grass and forage peanut in sheep. Revista Brasileira de Zootecnia 36, 471–479.
Garcia SC, Fulkerson WJ
(2005) Opportunities for future dairy systems: a review. Australian Journal of Experimental Agriculture 45, 1041–1055.
| Crossref | GoogleScholarGoogle Scholar |
Garcia SC,
Fulkerson WJ,
Kenny S, Nettle R
(2006) Producing over 40 t dry matter/ha per year through a complementary forage rotation system. Proceedings of the New Zealand Grassland Association 68, 69–73.
Garcia SC,
Fulkerson WJ,
Nettle R,
Kenny S, Armstrong D
(2007) FutureDairy: a national, multidisciplinary project to assist dairy farmers to manage future challenges – methods and early findings. Australian Journal of Experimental Agriculture 47, 1025–1031.
| Crossref | GoogleScholarGoogle Scholar |
Garcia SC,
Fulkerson WJ, Brookes SU
(2008) Dry matter production, nutritive value and efficiency of nutrient utilisation of a complementary forage rotation compared to a grass pasture system. Grass and Forage Science 63, 284–300.
| Crossref | GoogleScholarGoogle Scholar |
CAS |
Gourley CJP,
Powell JM,
Dougherty WJ, Weaver DM
(2007) Nutrient budgeting as an approach to improving nutrient management on Australian dairy farms. Australian Journal of Experimental Agriculture 47, 1064–1074.
| Crossref | GoogleScholarGoogle Scholar |
Horadagoda A,
Fulkerson WJ,
Nandra KS, Barcia IM
(2009) Grazing preferences by dairy cows for 14 forage species. Animal Production Science 49, 586–594.
| Crossref | GoogleScholarGoogle Scholar |
Jung GA,
Shaffer JA,
Stout WL, Panciera MT
(1988) Harvest frequency-effects on forage yield and quality of rapes and rape hybrids. Grass and Forage Science 43, 395–404.
| Crossref | GoogleScholarGoogle Scholar |
Kalmbacher RS,
Everett PH,
Martin FG, Jung GA
(1982) The management of Brassica for winter forage in the subtropics. Grass and Forage Science 37, 219–225.
| Crossref | GoogleScholarGoogle Scholar |
Mtengeti EJ,
Wilman D, Moseley G
(1995) Physical structure of white clover, rape, spurrey and perennial ryegrass in relation to rate of intake by sheep, chewing activity and particle breakdown. Journal of Agricultural Science 125, 43–50.
| Crossref | GoogleScholarGoogle Scholar |
Paynter BH, Hills AL
(2009) Barley and rigid ryegrass (Lolium rigidum) competition is influenced by crop cultivar and density. Weed Technology 23, 40–48.
| Crossref | GoogleScholarGoogle Scholar |
Rutter SM,
Champion RA, Penning PD
(1997) An automatic system to record foraging behaviour in free-ranging ruminants. Applied Animal Behaviour Science 54, 185–195.
| Crossref | GoogleScholarGoogle Scholar |
Sharaan AN, Abdel-Gawad KI
(1986) Effect of cultivars and seeding rate on forage yield and crude protein content in rape (Brassica napus L.). Annals of Agricultural Science. Moshtohor 24, 1857–1870.
Smith D
(1969) Removing and analysing total non-structural carbohydrates from plant tissue. Wisconsin Agricultural Station Research Report 41, 1–11.
Van Soest PJ
(1963) Use of detergents in the analysis of fibrous feeds. II. A rapid method for the determination of fibre and lignin. Journal of the Association of Official Analytical Chemists 46, 829–835.
|
CAS |
Van Soest PJ, Wine RH
(1967) Use of detergents in the analysis of fibrous feeds. IV. The determination of plant cell-wall constituents. Journal of the Association of Official Analytical Chemists 50, 50–55.
|
CAS |
White SL,
Sheffield RE,
Washburn SP,
King LD, Green JT
(2001) Spatial and time distribution of dairy cattle excreta in an intensive pasture system. Journal of Environmental Quality 30, 2180–2187.
|
CAS |
PubMed |
Wilkins PW
(1997) Useful variation in in-vitro digestibility within perennial ryegrass. Euphytica 93, 249–255.
| Crossref | GoogleScholarGoogle Scholar |
Yan T,
Frost JP,
Agnew RE,
Binnie RC, Mayne CS
(2006) Relationships among manure nitrogen output and dietary and animal factors in lactating dairy cows. Journal of Dairy Science 89, 3981–3991.
| Crossref | GoogleScholarGoogle Scholar |
CAS |
PubMed |
