Development and Assessment of a Nutritional Intervention to Improve Dairy Cow Milk Yield

Thesis Abstract

Increasing dairy cow milk yield remains a critical challenge for enhancing dairy productivity and ensuring food security in livestock-dependent economies. Suboptimal nutritional management is a primary factor limiting optimal milk production, necessitating the development of targeted nutritional interventions that are evidence-based and practically applicable. This study aims to develop and assess a comprehensive nutritional intervention designed to improve milk yield among dairy cows within commercial dairy farms. The specific objectives include identifying key nutritional deficiencies affecting milk production, formulating an optimized dietary regimen, evaluating the effects of the intervention on milk yield and composition, and analyzing economic implications for farmers. Employing a quasi-experimental research design, the study was conducted over a six-month period involving 120 lactating Holstein-Friesian dairy cows from six commercial farms in the region. The population was stratified based on lactation stage and parity to ensure representative sampling. A purposive sampling technique was employed to select farms and cows that met predefined criteria, ensuring homogeneity and reducing confounding variables. Data collection instruments comprised a structured dietary assessment checklist, feed intake records, milk yield measurement using calibrated lactometers, and laboratory analysis of milk composition through infrared spectroscopy. Nutritional status was assessed via blood metabolites, including glucose, non-esterified fatty acids (NEFA), and beta-hydroxybutyrate (BHBA), measured using enzymatic colorimetric assays. The intervention entailed formulating a tailored feed supplement based on proximate analysis, mineral, and vitamin supplementation, aligned with the theoretical framework of the Review of the Nutritional Ecology Theory and the Optimization of Ruminant Nutrition Model. Data analysis was conducted using descriptive statistics to outline baseline nutritional and production parameters, followed by inferential statistics including repeated-measures ANOVA to compare milk yield and composition across pre- and post-intervention phases. Regression analysis was employed to examine predictive relationships between nutritional variables and milk production outcomes. Thematic analysis of qualitative feedback from farm managers provided insights into practical applicability, while economic evaluation utilized cost-benefit analysis frameworks to assess the intervention’s viability. Expected findings suggest that the nutritional intervention will result in a statistically significant increase in average daily milk yield—anticipated to improve by 15-20%—with concurrent enhancements in milk fat and protein percentages. Blood metabolite profiles are expected to indicate improved energy balance and metabolic health among the cows subjected to the intervention. Economically, the intervention is projected to demonstrate a favorable cost-benefit ratio, substantiating its practicality for commercial farms. These outcomes are expected to fill existing literature gaps concerning region-specific nutritional strategies and their impact on milk productivity, contributing new evidence-based guidelines for dairy nutrition management. This study's contribution to knowledge lies in providing a scientifically validated nutritional protocol tailored to regional farming conditions, emphasizing the integration of laboratory diagnostics with practical feeding strategies. It offers a model for scalable intervention development, grounded in current nutritional theories and empirical data. The main conclusion underscores the importance of targeted, scientifically formulated nutritional interventions in enhancing milk yield and quality. Recommendations include incorporating routine nutritional assessments into dairy management practices, optimizing feed formulation processes, and training farmers on the application of improved feeding protocols. Future research should explore long-term implications, including reproductive performance and herd health, to further contextualize nutritional strategies within sustainable dairy production systems.