1. A 23 factorial with a split-plot allocation of treatments was used to investigate the effects of silage type, (sweet v. grain sorghum); level of urea, (60ν. 120 g. per head per day); vitamin A,(0ν. 40,000 i.u. per head per day), and intraruminal cobalt oxide pellet on the performance of steers fed rations of 90% sorghum grain, 10% sorghum silage.

1. An experiment was conducted in which lambs grazed on pastures of cocksfoot, ryegrass and tall fescue grown with and without white clover, as well as on pastures of pure white clover.

1. Six heifers were used in eight experiments to determine the digestibility of cacao-pod meal when fed in all-ground mixes of rice bran and rice bran with cottonseed meal.

1. A modified capacitance meter used to make rapid non-destructive measurements of growingpasture is briefly described.

1. The effects of CCC, (2-chloroethyl)-trimethyl ammonium chloride, on the grain yields of wheat and barley in Britain were studied in field experiments in 1964 and 1965.

1. A large direct calorimeter in the form of a pig: pen, with sleeping and dunging areas, is described. Groups of pigs can live in it for the whole fattening period, while sensible and evaporative heat lossesare measured continuously.

1. Observations were made on the casting, or accidental immobilization in dorsal recumbency, of Dorset Horn ewes under grazing conditions for a 12-month period.

1. Three groups of seven Southdown and seven medium wool Peppin Merino ewes were subjected, respectively, to seasons of daylength corresponding to a latitude of 60° S., reversed seasonal lighting (60° N.) and an equatorial daylength with reversed thermal seasons, for 2½ years. During the next 20 months group 1 continued as before. Group 2 had a 32-week photoperiodic year and group 3 had a 32-week thermal year with equatorial daylength.

1. Emergence and dry-matter production of largeand small seeds of two varieties of broad beans (Beladi and Rebaya 34) were studied.

A study of fibre-type arrays in relation to kemp succession in Kerry, Cheviot-cross and Swaledale lambs has been carried out. It is found that:

1. There is a general association between HH grade and array such that higher grades tend to have stronger arrays.

1. The rate of clean wool production, carcass apparisal and reticulo-ruminal development of grazing sheep were used to evaluate differences in pasture quality. Perennial ryegrass, cocksfoot and tall fescue pastures were assessed as pure stands and also white clover.

1. In 1960 a 'reference plot' experiment was begun on Stackyard field at Woburn, where arable crops had grown for many years. The soil contained very little N or HCl-soluble K and little HC1-soluble P; it was acid, but was limed before and during the experiment to a pH at or near 7.0. Very small plots (0-00145 acre) were used.

1. Milk fat obtained from six Clun Forest ewes was analysed in the 1st, 4th, 8th and 12th weeks of lactation for fat constant values and fatty-acid composition.

1. Twenty-one varieties of pasture grasses, including ten bred varieties, were grown on fertile soil for 3 years. Figures are presented of the rate of production of herbage cut every 3or4 weeks. Plots were cut in staggered sequence to permit growth intervals to overlap and to allow frequent assessments of the rate of production.

Three field trials with Italian ryegrass showed that solid N fertilizers usually gave larger yields than solutions containing 5% N but the differences were significant in only three of thirteen comparisons. More N was taken up from solid fertilizers than from solutions; the differences were not significant at 561b N/acre but were at 1121b N/acre. Grass given solutions had smaller percentage of N and the differences in the percentage of N were significant in eight of ten comparisons. In pot experiments with Italian ryegrass, solutions containing 3.3% N were less effective than solid fertilizers, but solutions containing 1.8% N were equally effective. Possible causes of solutions being less effective are discussed.

Calcium nitrate, or ammonium sulphate without or with 1% of the nitrification inhibitor 2-chloro-6 (trichloromethyl) pyridine were applied in the spring to winter wheat growing on clay- and sandyloam soils; 50 or 100 lb N/acre was applied on the clay-loam and 75 or 150 lb N/acre on the sandyloam. On permanent grassland ammonium nitrate or ammonium sulphate without or with 1 or 2% of inhibitor were broadcast to supply 100 or 200 lb N/acre. Winter wheat was sampled 32 days, and grass 68 days after applying fertilizers. Ammonium sulphate increased nitrate in the wheat on the clayloam soil but significantly less with than without the inhibitor. On the sandy-loam, wheat given ammonium sulphate with and without the inhibitor contained similar amounts of nitrate-N. The double amount of ammonium sulphate without inhibitor increased the nitrate content of grass most, and the nitrate content decreased with increasing amount of inhibitor.

1. The nutritive value and chemical composition of hybrid Napier, Napier and Jowar grasses and also a leguminous fodder, berseem, were studied using adult kumaoni steers.

1. The flow of digesta in the duodenum and the changes in the lipid composition of ruminal and duodenal digesta of sheep accustomed to receiving hay and oats, hay and palm oil and hay and tallow have been studied.

1. Calorimetric experiments on the utilization of dietary energy by the laying White Leghorn hen are described.

Net assimilation rate (E) was measured in three experiments involving related species and cultivated varieties with increasing grain yield potential in the genera Hordeum, Avena and Triticum. No consistent differences in E between the barley varieties were found, but in the oat and wheat experiments, Abundance and Atle respectively had lower values of E. However, these differences did not suggest that E had been influenced in selecting for grain yield. The relationship of E to dry-matter production was calculated and discussed.