PRICES were up and down at the Warwick Cattle Sale as export buyer attendance fell yesterday.   While some bullocks were up by 6c/kg, cows dropped to an average of 4 to 6 c/kg less.   Young cattle experienced strong support from feeder operators and restockers.   Trade cattle with lightweight lines were also dearer.   A combination of a decline in quality and less exporters in the buying panel resulted in cows not maintaining the prices of the previous sale to average 4c to 6c/kg less.   Calves returning to the paddock made to 333.2c to average 298c/kg.   Vealer steers also to restockers made to 338.2c, to average 327c/kg.   A small sample of vealer heifers to the trade made to 303.2c to 301c/kg.   Medium weight yearling steers to feed averaged 317c and made to 340c/kg.   Heavyweights to feed mostly sold in the 320c range with some to 334.2c, while local trade lines averaged 314c and made to 316.2c/kg.   Lightweight yearling heifers to restockers made to 301.2c with a fair sample around 290c/kg.   Medium weights to feed averaged 279c and local trade classes averaged 286c and made to 310c/kg.   Heavyweights also to the local trade market averaged 4c dearer at 295c and sold to 213.2c/kg.   Bullocks made to 315.2c to average 314c and plain condition full mouth bullocks averaged 281c/kg.   Medium weight 2 score cows averaged 220c, while good heavy cows averaged 261c with the occasional sale to 271.2c/kg.   Heavy bulls made to 285.2c/kg.