Biophysical and economic water productivity of dual-purpose cattle farming

Abstract

This study analyzes key factors influencing water productivity in cattle rearing, particularly in contexts characterized by water scarcity. This was done through year-round monitoring of on-farm practices within five smallholder farms located in the Saïss area (northern Morocco). The on-farm monitoring protocol consisted of characterizing: (i) volumes of water used for fodder production and distinguished by source (rainfall, surface irrigation and groundwater), (ii) virtual water contained in off-farm feed resources, (iii) total forage biomass production, (iv) dietary rations fed to lactating cows and their calves and (v) milk output and live weight gain. Findings reveal a mean water footprint of 1.62 ± 0.81 and 8.44 ± 1.09 m 3 /kg of milk and of live weight gain, respectively. Groundwater represented only 13.1% and 2.2% of the total water used to get milk and live weight gain, respectively, while rainfall represented 53.0% and 48.1% of the total water for milk and live weight gain, respectively. The remaining water volumes used came from surface irrigation water (7.4% for milk and 4.0% for live weight gain) and from virtual water (26.5% for milk and 44.7% for live weight gain). The results also revealed a relatively small gross margin per m 3 of water used by the herd, not exceeding an average value of US $ 0.05, when considering both milk and live weight. Given the large variability in farm performances, which affect water productivity in cattle rearing throughout the production process, we highlight the potential for introducing a series of interventions that are aimed at saving water, while concurrently improving efficiency in milk production and live weight gain. These interventions should target the chain of production functions that are implemented throughout the process of water productivity in cattle rearing. Moreover, these interventions are of particular importance given our findings that livestock production depends largely upon rainfall, rather than groundwater, in an area afflicted with sustained droughts, overexploitation of groundwater resources and growing water scarcity.Keywords: cattle, gross margin, live weight gain, milk, water productivity ImplicationsFew research results linking the livestock sector and its water use are available, at a time when a significant increase in animal production is expected to fulfill a rapidly growing demand. This study is based on the assumption that in regions with water scarcity, there is a need to consider improvements in water productivity in cattle farming operations. Our results suggest that more attention should be devoted to the origins of water (rainfall, rather than irrigation water from surface and groundwater, and virtual water in purchased feed) to implement sustainable livestock systems.

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Repenser le modèle de développement agricole du Maroc pour l’ère post Covid-19

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Water uses in sustainable agriculture practices: reconsidering the priorities in water scarce areas

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