Dairy R&D in SA

Discipline: health; 

Discipline: mastitis; Key words: Staphylococcus aureus, antimicrobial resistance, on-farm management. 

Discipline: production system; Key words: emerging dairy herds, smallholder dairy herds, INTERGIS, cow performance, management practices, milk yield, fat yield, SSC.

1. POINT OF DEPARTURE:

    

Discipline: development; Key words: entrepreneurship, dairy cattle, food security, indigenous knowledge systems.

The authors referenced below did a case study in the local municipality areas of Matatiele and Groblersdal to explore and identify the drivers of dairy smallholder farmer decisions. They found the following as determining factors:

• dairy farming is dominated by male farmers who were over 60 years old;

Dairy farms often experience a summer through autumn rise in somatic cell count (SCC) with some farms affected more than others.  The extent to which climatic factors contribute to this summer rise in SCC in South Africa is unknown although weather is blamed anecdotally. Consequently, the value of heat abatement or other preventative intervention cannot be established. The relative effect of season and/or heat stress on milk production and SCC is likely to be unique to South African conditions and therefore this formed the basis of the study cited below.

Discipline: reproduction; Key words:concentrate level, crossbreeding, days open, energy source, interval traits, genetic parameters, management-induced infertility. 

Because of high milk yield, some farmers of high producing TMR-based dairy herds  service cows later in the lactation period, i.e. after the live weight nadir point when live weight starts to increase because of a positive energy balance. Often maximum feed intake has been reached and milk yield is decreasing following peak milk yield. Some research has shown a positive response in conception when cows are inseminated at this stage of the lactation period.

 In recent years, there has been an increase in the prevalence of environmental pathogens as a cause of intra-udder infections (IUI) in dairy cattle. Increases in prevalence could potentially be ascribed to improved control methods for contagious pathogens, difficulties in controlling pathogens from an environmental reservoir and the ability of Streptococcus uberis and Escherichia coli to persist in the udder.

Smallholder dairy production, which is mainly characterised by a low input–low output production system, currently makes an insignificant contribution to the South African dairy industry. Several reasons can, however, be advanced to motivate the development of this sector. In Sub-Saharan Africa, in general, the performance of smallholder dairy cows is poor, suggesting low herd profitability. In order to develop the smallholder dairy sector, it is therefore important to identify herd production models or management strategies that would improve herd profitability.