Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Annual report of the Secretary for Agricultural Technical Services for the period 1 July 1971 to 30 June 1972.

Abstract

Progress in the livestock industry is reported on pp. 122-148. Information is given on the beef cattle performance testing scheme, with summarised data for the av. performance of 852 bulls of 5 breeds. Fat content in the muscles of Hereford, Simmental, Brown Swiss and Charolais crossbreds was 5.3, 4.1, 3.2 and 2.5% resp. Hybrid vigour in growth rate of Brahman, Charolais, Hereford and Simmental crosses was compared with that of Africanders; the Brahman crosses did particularly well in extensive conditions. Data are also given on the following: comparison of Jersey crosses with Africanders; milk recording; progeny testing of mutton sheep and performance testing of wooled sheep; development of a new White-wooled breed at Grootfontein Agricultural College and 2 other centres; lactation anoestrus in Mutton Merino ewes; early weaning of lambs in conjunction with the possibility of obtaining 3 lamb crops in 2 yr or 4 crops in 3 yr; breeding of Boer goats; boar performance testing. Measures to promote the production of both poultry and eggs are briefly described; these include the introduction of 3 strains of White Leghorns and the development of a table bird from a cross of a sex-linked Silver bird with White Plymouth Rock; imported broiler strains are included in the breeding programme at the Animal and Dairy Science Research Institute at Irene.<new para>ADDITIONAL ABSTRACT:<new para>A survey of Radopholus similis on banana made since 1969 has shown that the parasite is widespread along the Natal South Coast, with signs of infestation in the Transvaal Lowveld, South Africa. Other host plants which may be attacked by R. similis are brinjal, coffee, groundnut, maize, potato, plantain, sorghum, soybean, sugar-cane and tomato. In 1972 R. similis was recorded for the first time on banana in Zululand. Studies have been completed on Xiphinema, Histotylenchus, Paratrophurus, Uligirosus and on South African Criconematidae. Extensive surveys for Heterodera rostochiensis have been carried out since the first reported outbreak in 1971, 2 areas in the vicinity of Pretoria and one near Witwatersrand being found infested.<new para>ADDITIONAL ABSTRACT:<new para>Taenia crocutae cysticerci, Dipetalonema sp. and Schistosoma mattheei are reported in baboons in the Kruger National Park. Work by the department includes studies on Parafilaria bovicola in cattle, a survey on the seasonal incidence of nematodes in sheep (Haemonchus contortus, Trichostrongylus spp., Oesophagostomum columbianum, Trichuris ovis and Nematodirus spathiger) and studies on vectors (Bulinus tropicus and B. forskali) of Gastrodiscus aegyptiacus following reports of heavy infections in horses in the Transvaal.*.