@conference {40187,
	title = {A note on the use of number of permanent incisor teeth for determining age in sheep},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {49},
	year = {1989},
	month = {Jan},
	pages = {303-306},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Lambs in pens were infused duodenally with increasing amounts of   casein or a mixture of four essential amino acids (EAA) to examine   effects upon N retention. Eight Dorset Down x Coopworth lambs (39+/-1.1   kg) each fitted with rumen and duodenal cannulae were housed indoors and   offered freshly cut ryegrass/white clover pasture at a rate of 470g   fresh herbage/kgW0.75(MW)/d. The metabolizable energy intake from   herbage was approximately 870 kJ/kg(MW)/d.     Experimental treatments were duodenal infusions of water (control), 3,   6, 9 and 12g casein/kgMW/d and three levels of a mixture of AA   (methionine, lysine, histidine and arginine) in amounts equivalent to   the supply of these AA in 3, 6 and 9g casein. Treatments were allocated   in an 8 x 8 latin square design.     Duodenal non-ammonia N (NAN) flow indicated that 33\% of forage protein N   intake was lost across the rumen, the mean flow being 1.46gNAN/kgMW/d.   Infusions of casein resulted in significant linear increases (P<0.01) in   N balance up to 6g casein/kgMW/d, the casein N supply at this level   being equal to the N lost across the rumen from the basal forage. The   increase in N balance with infusion of 6g casein was equivalent to an   additional 96\% of the N balance observed with the control treatment. No   further significant change in N balance was observed with casein   infusions greater than 6g/kg/MW/d. A small non-significant response to   infusions of 4 AA was observed indicating that these 4 essential AA were   not solely responsible for the response. These results indicate that   liveweight gain responses can be expected if the losses of protein that   occur in the rumen of lambs grazing temperate pastures can be reduced.    },
	issn = {1176-5283},
	author = {Bray AR and Burton RN and Murray MA and Saville DJ}
}
