Browsing by Author "Matthew C"

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    Agronomy soundbites
    (Intelact Annual Conference, ) Matthew C
    Residuals Pasture persistence Clover % Endophytes Sowing rates for new grass Progibb Less N Climate change N-retention High sugar grasses / herbs
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    Difference in measuring machines & practical feed estimation
    Matthew C
    2 hour session for Zoetis refresher course for practicing veterinarians.
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    Dry matter yield, nutritive value and tiller density of tall fescue and perennial ryegrass swards under grazing
    (New Zealand Grassland Association, 31/12/2016) Hendricks S; Donaghy D; Matthew C; Bretherton M; Sneddon N; Cosgrove G; Christensen C; Kaufononga S; Howes J; Osborne M; Taylor P; Hedley M
    Alternative pasture species with the potential to supply quality forage during summer feed shortages, such as tall fescue (TF), are of interest to dairy farmers. A paddock scale study was undertaken to compare performance of TF managed on a shorter rotation similar to perennial ryegrass (RG) (TF-RG) with TF managed on a longer rotation more consistent with its morphology of 4 live leaves/tiller (TF-TF), and with RG (RG-RG). Accumulated dry matter (DM) yields were similar for the three treatments. Patch grazing was observed during the first spring, with more long patches in TFTF than in either TF-RG or RG-RG. Sown-species leaf area index (LAI) was greater in TF-TF compared with TF-RG and RG-RG (2.25, 1.56 and 0.90, respectively; P<0.05). The proportions of grass weeds were higher in the TF-RG (P<0.05) compared with TF-TF and RG-RG treatments (302, 207 and 164 g/kg DM, respectively). A soil fertility gradient with distance along the paddock away from the farm race was recorded, with Olsen P declining at 0.130 mg/kg/m with distance from the farm race. Tiller density, LAI and yield of sown species and total yield sampled were all positively correlated with Olsen P. Overall, this study highlights the importance of managing TF pastures according to its specific growth habits. However, attaining longer grazing rotations under field conditions whilst trying to maintain cow intakes, is likely to continue to prove elusive.
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    EMERGING INFORMATION ON AGRONOMIC TRAITS CONTRIBUTING TO DROUGHT RESISTANCE IN PERENNIAL RYEGRASS AND TALL FESCUE
    (New Zealand Institute of Agricultural and Horticultural Sciences, ) Matthew C; Ryan, M
    We overview results from experiments conducted at Massey University to better define the agronomic basis of drought resistance in perennial ryegrass and tall fescue. Average November-to-April moisture deficit at Palmerston North was estimated as equivalent to 258 mm rainfall. In contrast, breeding for a 10 cm increase in root depth was predicted to provide the equivalent of 16 mm additional rainfall. Breeding for increased water use efficiency is also a possibility but such gains are also not expected to eliminate summer moisture deficit in the average year. In general germplasm of North African origin exhibited deeper rooting and reduced leaf extension rate in summer, but paradoxically increased stomatal conductance compared to germplasm originating from Europe. In one experiment some plants unwatered for 90 days remained green but we are uncertain as to the basis of this response. Measurement of gravimetric soil moisture content (GSMC) at approximately 30 cm depth was found to be informative, often more so than more sophisticated measurements like leaf water potential. With respect to current commercial cultivars of perennial ryegrass, we found evidence of variation in water use efficiency (greater plant weight associated with higher GSMC) between individual plants of Grasslands Samson, meaning that selection for this trait could be rewarding. A cultivar we examined that incorporated Spanish germplasm also exhibited similar evidence of high water use efficiency. We found evidence that Neotyphodium endophyte can improve leaf hydration in perennial ryegrass in moderate drought stress.
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    Evolution in configuration and productivity of new zealand hill country sheep and beef cattle systems
    (MDPI (Basel, Switzerland), 2021-06-08) Gobilik J; Morris ST; Matthew C; Adriana B
    Metabolic energy budgeting (MEB) was used to evaluate evolution over 30 years (1980–1981 to 2010–2011) in New Zealand southern North Island ‘hill country’ sheep and beef cattle systems. MEB calculates energy required by animals for body weight maintenance, weight gain or loss, pregnancy, and lactation to estimate the system feed demand and thereby provide a basis for calculating feed conversion efficiency. Historic production systems were reconstructed and modeled using averaged data from industry surveys and data from owners’ diaries of three case-study farms and reviewed for patterns of change over time. The modeling indicated that pasture productivity was 11% lower and herbage harvested was 14% lower in 2010–2011 than in the early 1980s. This productivity decline is attributable to warmer, drier summer weather in recent years. However, primarily through increased lambing percentage, feed conversion efficiency based on industry data improved over the study period from 25 to 19 kg feed consumed per kg lamb weaned, while meat production rose from 137 to 147 kg per ha per year. Similar improvements were observed for the three case farms. The New Zealand MEB model was found effective for analysis of tropical beef production systems in Sabah, Malaysia.
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    Exploring root traits associated with increased yield under water deficit in perennial ryegrass (Lolium perenne L.) germplasm of Mediterranean and European origins.
    (2015-10) Huassion S; Matthew C; Naeem M; Easton HS
    Exploring root traits associated with increased yield under water deficit in perennial ryegrass (Lolium perenne L.) germplasm of Mediterranean and European origins Sajjad Hussain1, Cory Matthew2, Muhammad Naeem3, H. Sydney Easton4 1Plant Genetic Resources Institute, National Agricultural Research Center, Islamabad, Pakistan, 2Institute of Agriculture and Environment, Massey University, Palmerston North, New Zealand, 3Federal Seed Certification and Registration Department, Islamabad, Pakistan, 4AgResearch, Palmerston North, New Zealand. Contact: shmalik25@hotmail.com Introduction Perennial ryegrass (Lolium perenne L.) is now one of the most widely used forage grass species in temperate pastoral agriculture and in recent years breeding for improved performance in summer drought conditions has become a focus. Germplasm of Spanish origin has been widely used in New Zealand plant breeding (Stewart, 2006), but another possibility that has attracted comparatively little research to date is introgression of summer dormant germplasm of North African origin with material of European origin. Methods Plants of a New Zealand-bred perennial ryegrass cultivar “Grasslands Samson”, a summer dormant Australian cultivar “Medea” developed in the 1960’s from germplasm of Mediterranean origin (Silsbury, 1961), and the F1 and F2 progenies of the two parents were compared during summer 2010-11 in a glasshouse study at Palmerston North, New Zealand. The experiment compared rooting behavior and herbage yield of the two cultivars and studied the pattern of inheritance of those traits to F1 and F2 progeny. Plants grown in 100 cm lengths of soil-filled PVC pipes were initially bottom-watered in 200 liter drums and then drought was imposed by gradually lowering the water table until plants survived on water retained in the soil profile. At a concluding destructive harvest, herbage yield (DW) and tiller number (TN) were recorded, while total root mass (Rt), coarse root mass (Rc) fine root mass (Rf) and gravimetric soil moisture % (SMC) were all measured for three soil depths (0-30, 30-60 and below 60 cm). From these data root:shoot ratio (R:S), deep root (below 30 cm): shoot ratio (DR:S), an index of deep rooting (% total root below 30 cm, IDR), and DW/(0.2 – SMC) as an index of efficient water use (IEWU) were derived. Results and Discussion Medea exhibited deep rooting compared to Grasslands Samson indicated by higher R:S, DR:S and IDR, that had never been studied since its release in Australia. However, it had lower IWU, 83% lower DW and 87% lower TN than Grasslands Samson – a characteristic of Mediterranean origin pasture species. On the question of introgressing root traits of Medea to Grasslands Samson: in the F1 generation, some plants surpassed Medea for some root traits (eg DR:S and IDR), while F2 plants were similar to Grasslands Samson parents, However, within Grasslands Samson itself some plants showed high IEWU. Conclusion Introgression of Medea genes into Grasslands Samson will not be straight forward. However, direct selection for maintenance of growth under moderate water deficit with reduced soil moisture extraction per unit DW is an immediate option for improving drought tolerance in perennial ryegrass, providing the trait proves sufficiently heritable. Stewart AV (2006) Genetic origins of perennial ryegrass (Lolium perenne) for New Zealand Pastures. Pp11-20 In: Breeding for success: diversity in action, (ed, CF. Mercer) Proceedings of the 13th Australasian Plant Breeding Conference, Christchurch, NZ. Silsbury JH (1961) A study of dormancy, survival and other characteristics in Lolium perenne L. at Adelaide, SA. Aust. J. Ag. Res.12:1-9.
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    Facilitating vertical integration of knowledge from animal physiology to farm system level
    (2012) Matthew C; Parkinson T; Kemp P
    We describe a teaching methodology evolved over 25 years for taking incoming students with little farming background to near-consultancy level in terms of ability to discuss feed supply and demand manipulation with practicing farmers. The methodology is currently used in a double semester course offering to 2nd year BVSc students at Massey University with positive feedback from students. Component skills such as visual assessment of herbage mass are introduced at the outset. A keystone of the methodology is the provision of student operated 'farmlets' with 16 sheep on 0.8 ha, where the storage of autumn-surplus feed as increased herbage mass, and release back to animals for winter and early lactation feed is demonstrated. Feed budget calculations for these farmlets in units of MJ metabolisable energy and kg pasture DM/ha/ day promote understanding of animal physiology principles and simulate those of a larger scale commercial farm. As currently offered the module comprises 20 lectures and 5 organised 2 hour farmlet discussion and data collection visits. Students complete additional farmlet work in their own time, such as moving or weighing sheep. Two written assignments promote integration of component knowledge and ownership of that information by participants.
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    Impact of novel-endophytes on adult Argentine stem weevil damage of ryegrass seedlings.
    (2015) Ruppert KG; Matthew C; Lloyd-West C; Popay A
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    Integrated transcriptome and proteome analyses reveal potential mechanisms in Stipa breviflora underlying adaptation to grazing
    (John Wiley and Sons Australia, Ltd on behalf of Chinese Grassland Society and Lanzhou University, 2024-03-14) Liu Y; Sun S; Zhang Y; Song M; Tian Y; Lockhart PJ; Zhang X; Xu Y; Dang Z; Matthew C
    Background: Long-term overgrazing has led to severe degradation of grasslands, posing a significant threat to the sustainable use of grassland resources. Methods: Based on the investigation of changes in functional traits and photosynthetic physiology of Stipa breviflora under no grazing, moderate grazing, and heavy grazing treatments, the changes in expression patterns of genes and proteins associated with different grazing intensities were assessed through integrative transcriptomic and proteomic analyses. Results: Differentially expressed genes and proteins were identified under different grazing intensities. They were mainly related to RNA processing, carbon metabolism, and secondary metabolite biosynthesis. These findings suggest that long-term grazing leads to molecular phenotypic plasticity, affecting various biological processes and metabolic pathways in S. breviflora. Correlation analysis revealed low correlation between the transcriptome and the proteome, indicating a large-scale regulation of gene expression at the posttranscriptional and translational levels during the response of S. breviflora to grazing. The expression profiles of key genes and proteins involved in photosynthesis and phenylpropanoid metabolism pathways suggested their synergistic response to grazing in S. breviflora. Conclusions: Our study provides insight into the adaptation mechanisms of S. breviflora to grazing and provides a scientific basis for the development of more efficient grassland protection and utilization practices.
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    Observations on the role of endophyte in field performance of ryegrass and tall fescue in New Zealand
    Matthew C
    Presented to: breakout meeting of the China/JapanKorea Grassland Association: “International Symposium on Forage Disease and Grassland Management” held at College of pastoral Agriculture, Science & Technology, Lanzhou Univesity
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    Practical Feed Estimation
    Matthew C
    Measuring machines Why farmers measure cover; Ways to measure cover (Plate / Probe / Visual / CDAX); Controlling variability. Practical feed estimation Intake estimation from pre- and post grazing mass; Supplementary matters: rotation length vs animal intake, pasture growth, & pasture quality.
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    Seasonal variation in soil and herbage CO2 efflux for a sheep-grazed alpine meadow on the north-east Qinghai-Tibetan Plateau and estimated net annual CO2 exchange
    (2/06/2022) Yuan H; Matthew C; He XZ; Sun Y; Liu Y; Zhang T; Gao X; Yan C; Chang S; Hou F
    The Qinghai-Tibetan Plateau is a vast geographic area currently subject to climate warming. Improved knowledge of the CO2 respiration dynamics of the Plateau alpine meadows and of the impact of grazing on CO2 fluxes is highly desirable. Such information will assist land use planning. We measured soil and vegetation CO2 efflux of alpine meadows using a closed chamber technique over diurnal cycles in winter, spring and summer. The annual, combined soil and plant respiration on ungrazed plots was 28.0 t CO2 ha-1 a-1, of which 3.7 t ha-1 a-1occurred in winter, when plant respiration was undetectable. This suggests winter respiration was driven mainly by microbial oxidation of soil organic matter. The winter respiration observed in this study was sufficient to offset the growing season CO2 sink reported for similar alpine meadows in other studies. Grazing increased herbage respiration in summer, presumably through stimulation of gross photosynthesis. From limited herbage production data, we estimate the sustainable yield of these meadows for grazing purposes to be about 500 kg herbage dry matter ha-1 a-1. Addition of photosynthesis data and understanding of factors affecting soil carbon sequestration to more precisely determine the CO2 balance of these grasslands is recommended.
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    Soil C, N, and P stocks evaluation under major land uses on China’s Loess Plateau
    (Society for Range Management, 1/03/2017) Chen X; Hou F; Matthew C; He XZ
    Loess Plateau covers 640 000 km2 in the central northern China. Despite a semiarid environment, harsh winters, and hot summers, agriculture has been practiced in this region for > 5 000 yr, and the food production systems are among China's oldest. The environment is fragile because the loessial soils are prone to erosion. Sound scientific information is therefore required to underpin future land use planning in the region. To this end, total soil organic carbon (SOC), N, and P stocks were measured in Huanxian County of the wider Loess Plateau, representing five major land use categories. Sites were sampled three times over 3 yr. In all, almost 2 800 soil analyses were performed. A feature of these soils is low SOC content in the A horizon but comparatively small decline with soil depth. For example, SOC levels for the 0-20 cm and 70-100 cmsoil depths averaged 6.1 and 4.1Mg ha-1, respectively. Alfalfa and rangeland sites had 5.1 Mg ha-1 (10%) more total than cropland and 7.5 t ha-1 (16%) more total SOC to 100-cm soil depth than the two silvopastoral sites. For total soil N (0- to 100-cm soil depth) the averages of alfalfa and RL siteswere 20% and 28%, respectively, higher than the cropland and silvopastoral site group means, although soil C, N, and P levels are very low, relative to those of typical soils elsewhere. When these observations are scaled up to a regional level, it can be calculated that a 5% shift in land use from cropping or silvopastoral systems to alfalfa-based systems could increase soil C sequestration by as many as 20 million t CO2 per yr, although some caution is needed in making extrapolations, as the present data are from a single locality on the Loess Plateau.
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    The seed of life, investigating Epichloe endophyte colonisation.
    (2015) Zhang W; Card S; McGill CR; Matthew C; Cristensen M; Mace W
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    Transcriptome-Wide Gene Expression Plasticity in Stipa grandis in Response to Grazing Intensity Differences
    (MDPI (Basel, Switzerland), 2021-11-02) Dang Z; Jia Y; Tian Y; Li J; Zhang Y; Huang L; Liang C; Lockhart PJ; Matthew C; Li FY; Hobza R
    Organisms have evolved effective and distinct adaptive strategies to survive. Stipa grandis is a representative species for studying the grazing effect on typical steppe plants in the Inner Mongolia Plateau. Although phenotypic (morphological and physiological) variations in S. grandis in response to long-term grazing have been identified, the molecular mechanisms underlying adaptations and plastic responses remain largely unknown. Here, we performed a transcriptomic analysis to investigate changes in gene expression of S. grandis under four different grazing intensities. As a result, a total of 2357 differentially expressed genes (DEGs) were identified among the tested grazing intensities, suggesting long-term grazing resulted in gene expression plasticity that affected diverse biological processes and metabolic pathways in S. grandis. DEGs were identified in RNA-Seq and qRT-PCR analyses that indicated the modulation of the Calvin-Benson cycle and photorespiration metabolic pathways. The key gene expression profiles encoding various proteins (e.g., ribulose-1,5-bisphosphate carboxylase/oxygenase, fructose-1,6-bisphosphate aldolase, glycolate oxidase, etc.) involved in these pathways suggest that they may synergistically respond to grazing to increase the resilience and stress tolerance of S. grandis. Our findings provide scientific clues for improving grassland use and protection and identifying important questions to address in future transcriptome studies.
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    Which way forward in the quest for drought tolerance in perennial ryegrass
    (NEW ZEALAND GRASSLAND ASSOC, 2012) Matthew C; van der Linden A; Hussain S; Easton HS; Hatier JHB; Horne DJ; Swain, D
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    Workshop on Publication Preparation
    Matthew C; Millner; Wood