Search Results - "Waghorn, G.C."

Lowering ruminant methane emissions through improved feed conversion efficiency by Waghorn, G.C, Hegarty, R.S

“…Improvements in feed conversion efficiency (FCE) can be applied to individual animals as well as to production from land, as in a farm system. Our focus…”
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Nitrogen metabolism and rumen microbial enumeration in lactating cows with divergent residual feed intake fed high-digestibility pasture by Rius, A G, Kittelmann, S, Macdonald, K A, Waghorn, G C, Janssen, P H, Sikkema, E

“…Dairy cattle selected for negative residual feed intake (n-RFI; efficient) should maintain production while reducing dry matter intake over a lactation because…”
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Improving production efficiency as a strategy to mitigate greenhouse gas emissions on pastoral dairy farms in New Zealand by Beukes, P.C., Gregorini, P., Romera, A.J., Levy, G., Waghorn, G.C.

“…New Zealand's commitment to the Kyoto Protocol requires agriculture, including dairy farming, to reduce current greenhouse gas (GHG) emissions by about 20% by…”
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Methane emissions from sheep fed fresh brassicas (Brassica spp.) compared to perennial ryegrass (Lolium perenne) by Sun, X.Z, Waghorn, G.C, Hoskin, S.O, Harrison, S.J, Muetzel, S, Pacheco, D

“…Four forage brassicas, kale (Brassica oleracea L. cv. Kestrel), turnip (B. campestris L. cv. Appin), rape (B. napus L. cv. Titan) and swede (B. napus L. cv…”
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Accuracy of genomic predictions of residual feed intake and 250-day body weight in growing heifers using 625,000 single nucleotide polymorphism markers by Pryce, J E, Arias, J, Bowman, P J, Davis, S R, Macdonald, K A, Waghorn, G C, Wales, W J, Williams, Y J, Spelman, R J, Hayes, B J

“…Feed makes up a large proportion of variable costs in dairying. For this reason, selection for traits associated with feed conversion efficiency should lead to…”
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Relationships between residual feed intake, average daily gain, and feeding behavior in growing dairy heifers by Green, T C, Jago, J G, Macdonald, K A, Waghorn, G C

“…Residual feed intake (RFI) is a measure of an individual's efficiency in utilizing feed for maintenance and production during growth or lactation, and is…”
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Methane emissions from dairy cows measured using the sulfur hexafluoride (SF6) tracer and chamber techniques by Grainger, C, Clarke, T, McGinn, S M, Auldist, M J, Beauchemin, K A, Hannah, M C, Waghorn, G C, Clark, H, Eckard, R J

“…Our study compared methane (CH4) emissions from lactating dairy cows measured using the sulfur hexafluoride (SF6) tracer and open-circuit respiration chamber…”
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Development of an in situ procedure to evaluate the reticulo-rumen morphology of sheep selected for divergent methane emissions by Waite, S. J., Zhang, J., Cater, J. E., Waghorn, G. C., Bain, W. E., McEwan, J. C., Suresh, V.

“…Published studies have shown that methane yield (g CH4/kg dry matter) from sheep is positively correlated with the size (volume and surface area) of the…”
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Characteristics of boli formed by dairy cows upon ingestion of fresh ryegrass, lucerne or chicory by Minnee, E. M. K., Waghorn, G. C., Gregorini, P., Bryant, R. H., Chapman, D. F.

“…This study examined the comminution of fresh herbage, subsequent nutrient release, and the characteristics of swallowed boli from three physically and…”
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Effects of feeding fresh white clover (Trifolium repens) or perennial ryegrass (Lolium perenne) on enteric methane emissions from sheep by Hammond, K.J., Hoskin, S.O., Burke, J.L., Waghorn, G.C., Koolaard, J.P., Muetzel, S.

“…Enteric CH4 contributes about one third of New Zealand's greenhouse gas emissions. Measurements from our laboratory using the sulfur hexafluoride (SF6)…”
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Measuring residual feed intake in dairy heifers fed an alfalfa (Medicago sativa) cube diet by Waghorn, G C, Macdonald, K A, Williams, Y, Davis, S R, Spelman, R J

“…Selection for divergence between individuals for efficiency of feed utilization (residual feed intake, RFI) has widespread application in the beef industry and…”
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Cultivar and age of regrowth effects on physical, chemical and in sacco degradation kinetics of vegetative perennial ryegrass ( Lolium perenne L.) by Sun, X.Z., Waghorn, G.C., Clark, H.

“…Perennial ryegrass is the principal component of diets fed to ruminants in New Zealand. Selection for ryegrass improvement should incorporate measures relating…”
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Divergence for residual feed intake of Holstein-Friesian cattle during growth did not affect production and reproduction during lactation by Macdonald, K. A., Thomson, B. P., Waghorn, G. C.

“…Residual feed intake (RFI) is the difference between actual and predicted dry matter intake (DMI) of individual animals. Recent studies with Holstein-Friesian…”
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Supplementing lactating dairy cows fed high-quality pasture with black wattle (Acacia mearnsii) tannin by Griffiths, W. M., Clark, C. E. F., Clark, D. A., Waghorn, G. C.

“…A reduction in urinary nitrogen (N) excretion from dairy cows fed pasture containing a high N concentration in the dry matter (DM) will have environmental…”
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Effect of diet on populations of three species of ruminal cellulolytic bacteria in lactating dairy cows by Weimer, P J, Waghorn, G C, Odt, C L, Mertens, D R

“…The effects of four contrasting diets were determined on populations of three species of ruminal cellulolytic bacteria (Ruminococcus albus, Ruminococcus…”
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Intestinal amino acid absorption in lambs fed fresh Lucerne (Medicago sativa) during an established Trichostrongylus colubriformis infection by Bermingham, E. N., Roy, N. C., Sutherland, I. A., Waghorn, G. C., Sinclair, B. R., Peters, J. S., McNabb, W. C.

“…The effects of an established Trichostrongylus colubriformis infection on amino acid (AA) absorption from the small intestine and their availability to other…”
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A review of technical variations and protocols used to measure methane emissions from ruminants using respiration chambers, SF6 tracer technique and GreenFeed, to facilitate global integration of published data by Della Rosa, M.M., Jonker, A., Waghorn, G.C.

“…•Variation in protocols affects the comparability and defensibility of data.•Measurement days in respiration chambers vary between studies.•Gas recovery from…”
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Including chicory or plantain in a perennial ryegrass/white clover-based diet of dairy cattle in late lactation: Feed intake, milk production and rumen digestion by Minneé, E.M.K., Waghorn, G.C., Lee, J.M., Clark, C.E.F.

“…•Including chicory or plantain (forbs) in a grass-based diet of dairy cattle did not consistently improve milk production.•Dietary inclusion of forbs had…”
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The effects of fresh forages and feed intake level on digesta kinetics and enteric methane emissions from sheep by Hammond, K.J., Pacheco, D., Burke, J.L., Koolaard, J.P., Muetzel, S., Waghorn, G.C.

“…•Methane and digesta kinetics were measured from sheep fed fresh forages.•Neither fresh forage composition nor digestibility affected CH4 yield from…”
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Effects of feed intake on enteric methane emissions from sheep fed fresh white clover (Trifolium repens) and perennial ryegrass (Lolium perenne) forages by Hammond, K.J., Burke, J.L., Koolaard, J.P., Muetzel, S., Pinares-Patiño, C.S., Waghorn, G.C.

“…Published analyses of enteric methane (CH4) emissions from sheep and cattle show an inverse relationship between feed intake and CH4 yield (gCH4/kg dry matter…”
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