@conference {60960,
	title = {Dairy cows and horses do not select oaten hay based on its greenness : Brief Communication},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {69},
	year = {2009},
	month = {Jun},
	pages = {132-134},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	address = {Christchurch},
	abstract = {Domestic and export markets for oaten hay are driven largely by estimates of the quality of hay produced. This assessment is commonly based on the plant of origin and subjective criteria, such as colour, or {\textquoteright}greenness{\textquoteright}, and general appearance as judged by an observer. However, subjective measures such as these are not always reliable indicators of an animal{\textquoteright}s response to a hay when offered, in terms of its intake and ultimate performance. Understanding the role of specific plant characteristics that... Continued },
	issn = {1176-5283},
	author = {Pain SJ and Revell DK}
}
@conference {41426,
	title = {Development of a technique to evaluate the role of elevated maternal thyroid hormone concentrations in the birthweight response to mid-pregnancy shearing.},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {63},
	year = {2003},
	month = {Jan},
	pages = {149-151},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	address = {Queenstown},
	abstract = {Several studies have shown that lambs born to mid-pregnancy shorn ewes are heavier at birth than those born to unshorn ewes (Morris et al. 2000, Kenyon et al. 2002a,b) but, the mechanism responsible has not been identified. Morris et al. (2000) observed elevated maternal triiodothyronine (T3) concentrations over a 20-day period after shearing at mid-pregnancy in both single- and twin-bearing ewes and subsequently found an increased birthweight in the singletons. Symonds et al. (1989) also reported maternal T3 and T4 concentrations to be higher in pregnancy-shorn housed ewes although, an altered birthweight was not reported. },
	issn = {1176-5283},
	author = {Kenyon PR and Parkinson TJ and Revell DK and Morris ST and McCutcheon SN}
}
@conference {41319,
	title = {Ammonia and urea utilisation in lambs infected with Trichostrongylus colubriformis and fed fresh lucerne (Medicago sativa)},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {62},
	year = {2002},
	month = {Jan},
	pages = {77-80},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	address = {Palmerston North},
	abstract = {The effect of a Trichostrongylus colubriformis infections on ammonia and urea fluxes across the mesenteric-drained viscera (MDV), portal-drained viscera (PDV), and liver was investigated using an arterio-venous preparation in lambs fed fresh lucerne (Medicago sativa). The lambs were infected with 6000 T. colubriformis L3 larvae per day for 6 days (n=5) or kept as parasite free controls (n=5). On day 48 of the experiment, the lambs were infused continuously for 8 hours with r-aminohippuric acid (688 mg/h) into the mesenteric vein in order to measure plasma flow across the MDV, PDV and liver. Blood was continuously collected from the mesenteric artery and vena cava for consecutive two hour periods throughout the infusion period and plasma was harvested. Plasma concentrations of ammonia and urea were unaffected by the presence of intestinal parasites. Ammonia fluxes across the MDV, PDV, and liver were similar between treatment groups. Urea fluxes were also similar between treatment groups with the exception of the PDV, which showed a net release of urea in the parasite group and a net uptake by the control group (P=0.03). This suggests that the presence of a sub-clinical T. colubriformis infection does not increase the demand on the lamb for amino acids for ureagenesis. },
	issn = {1176-5283},
	author = {Bermingham EN and Roy NC and Reynolds GW and Sinclair BR and Peters JS and Sutherland IA and Waghorn GC and Revell DK and McNabb WC}
}
@conference {41266,
	title = {The effect of condensed tannins in sainfoin (Onobrychis viciifolia) and sulla (Hedysarum coronarium) on the digestion of amino},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {61},
	year = {2001},
	month = {Jan},
	pages = {116-119},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	address = {Christchurch},
	abstract = {Two experiments were conducted in order to compare the effect of condensed tannins (CT) in sainfoin (Onobrychis viciifolia) and sulla (Hedysarum coronarium) on the flux of amino acids (AA) through the gastrointestinal tract of sheep. In each experiment, one group of sheep (PEG group; CT inactive) received an intraruminal infusion of polyethylene glycol (PEG) to inactivate the CT present in the forages, while the other group received an intraruminal infusion of water (Tannin group; CT active). The CT in sainfoin (38.1 g/kg DM) had no significant effect on apparent AA absorption from the small intestine. However, in the sulla-fed sheep, AA absorption in the small intestine was significantly increased by CT (P<0.05; CT = 64.4 g/kg DM). In both forages a shift in AA digestion from the rumen to the small intestine was seen with increased abomasal fluxes of AA in the Tannin group of sainfoin- (92 versus 101 g/day in the PEG and Tannin group, respectively; P<0.05) and sulla-fed (65 versus 83 g/day; P<0.001) sheep. Differences in the digestion and absorption of AA in the two forages may be associated with differences in chemical structure of the CT. },
	issn = {1176-5283},
	author = {Bermingham EN and Hutchinson KJ and Revell DK and Brookes IM and McNabb WC}
}
@conference {41076,
	title = {Improving lamb birth weight through mid-to-late-pregnancy shearing: a review of recent studies},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {59},
	year = {1999},
	month = {Jan},
	pages = {70-72},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {A series of five experiments have been conducted at Massey University to determine whether mid- to late-pregnancy shearing of ewes might provide an opportunity to increase lamb birthweights and enhance survival, particularly of multiple-born lambs, under New Zealand{\textquoteleft}s pastoral conditions. Although birthweight responses were seen in most studies, they were not consistent with respect to the magnitude of the response or its occurrence in singles vs twins. However, when comparison was made across studies there was a strongly negative relationship between the size of the response and the birthweights of control lambs (those from unshorn ewes). We conclude that responses to mid- to late-pregnancy shearing are likely to be greatest when fetal growth in unshorn ewes is limited by maternal constraint. },
	issn = {1176-5283},
	author = {Kenyon PR and Morris ST and Revell DK and McCutcheon SN}
}
@conference {41025,
	title = {The effects of a cation-anion balanced diet on calcium and phosphorus metabolism in growing lambs},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {58},
	year = {1998},
	month = {Jan},
	pages = {192-194},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {During the past decade, there has been renewed interest and research in the role of the dietary cation-anion balance (DCAB) in controlling Ca and P homeostasis. Two diets differing in DCAB (either high DCAB, 250 meq/kg DM, or low DCAB, -100 meq/kg DM) were fed to 10 Romney lambs. Feeding low DCAB decreased urine pH by 2.0 pH units; from 8.2 (SE=0.45) to 6.2 (SE=0.50), indicative of the anticipated changes in the ionic balance associated with alterations in the dietary CAB. Plasma concentrations of Ca and P, and whole-body Ca and P balance (intake-excretion) were similar for both groups of sheep. Reducing the dietary CAB caused a 7-fold increase in the urinary excretion of Ca (low DCAB 0.75 g/day vs high DCAB 0.11 g/day; P=0.001).The apparent absorption of Ca in the low DCAB and high DCAB groups were 1.6 and 1.3 g/day, respectively, although there was no significant difference between the two groups. These data indicate that lowering the DCAB increases urinary excretion of Ca of growing lambs without affecting Ca balance due to an alteration in the movement of Ca to and from bone. Similar changes in Ca absorption and utilisation have been observed in dairy cows, suggesting that the growing lamb is a suitable model for future studies in the regulation of Ca homeostasis in dairy cattle. },
	issn = {1176-5283},
	author = {Wilson KL and Min S and Revell DK and Lee J and MacKenzie DDS and Cottam YH and Davis SR}
}
@conference {41014,
	title = {The role of cysteine in the increased parasite susceptibility of Romney sheep selected for hogget fleece-weight.},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {58},
	year = {1998},
	month = {Jan},
	pages = {150-153},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {To investigate the potential role of cysteine in the increased parasite susceptibility of sheep selected for increased wool production, ten sheep from both fleece-weight-selected (FW) and randomly-selected (C) Romney lines received either 2g of supplemental cysteine per day, or saline, via abomasal infusion. Following drenching to remove any pre-existing parasites, all sheep were dosed with Haemonchus contortus and Trichostrongylus colubriformis infective larvae. Cysteine infusion elevated plasma cysteine levels by an average of 65\% (P<0.0001). Off-pasture faecal egg counts (FEC) were higher in FW than C sheep (645 versus 200 eggs/g, P<0.01). No significant effects of line or infusion treatment on FEC were observed following the trial infection, though on days 52, 57 and 58, FEC in sheep receiving saline were at least twice those of sheep receiving cysteine. Total H. contortus counts were greater in FW than C lines of sheep (1208 versus 1055, P<0.05), while total numbers of T. colubriformis did not differ between lines or infusions. This study confirms the greater susceptibility of FW sheep to internal parasites, and suggests cysteine may influence certain aspects of immunocompetency in sheep. },
	issn = {1176-5283},
	author = {Miller FM and Blair HT and Reynolds GW and Revell DK}
}
@conference {40932,
	title = {Metabolic changes in the mammary gland of sheep prior to, and at, parturition.},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {57},
	year = {1997},
	month = {Jan},
	pages = {209-211},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Four sheep fitted with an indwelling catheter in the femoral artery and a transit time ultrasonic flow probe around the left pudendal artery (supplying the mammary gland) were used to quantitate changes in mammary blood flow (MBF) in late pregnancy and lactation, and to determine the extraction of glucose and oxygen by the mammary gland. Mammary vein blood samples were collected by venipuncture. Considerable variation existed in the pattern of change in MBF between individual sheep. In two animals, MBF through the pudic artery fitted with the flow probe doubled to 600 mL/min on the day of lambing (DL), while in the other two sheep, MBF varied little in response to lambing. Possible explanations for this difference between individuals are discussed. Glucose extraction trebled on DL from 6.0 to 18.7\% (P<0.01) and remained high during lactation in relation to milk output. Oxygen extraction by the mammary gland peaked during the last week of pregnancy (at 45.7\%) and during lactation it was related linearly to milk output. },
	issn = {1176-5283},
	author = {Revell DK and Harris PM and Cottam YH and Reynolds GW and Lee J}
}
