Productive, Reproductive, Behavioural, Gene Expression, Histological, and Economic Criteria of Feeding Fenugreek and Berseem Seeds as Alternative Protein Sources in New Zealand White Does Rabbits (Oryctolagus Cuniculus)

Abstract

Feed cost represents about 70% of the total production costs of rabbit farms. There is little research on the usage of Berseem and Fenugreek seeds as substitutes for soybeans in rabbit diets. The current investigation was conducted to assess the influence of dietary inclusion of Fenugreek and/or Berseem seeds at varying levels as a substitute for soybean meal on reproductive performance, milk production, maternal behaviour, economic efficiency, mammary gland and ovarian histology, and relative expression of reproductive genes of New Zealand White rabbit does. Eighty fully grown New Zealand White does weighing between 2.75 and 3.00 kg live weight and aged 5–6 months old were utilized. Rabbits were allocated into four groups (20 rabbits/group): control group (basal diet), T1 (5% fenugreek), T2 (15% Berseem seeds), and T3 (2.5% Fenugreek with 7.5% Berseem seeds). We noticed that the dietary inclusion of Fenugreek and/or Berseem seeds significantly improved weight and total weight gain of litters. The increased body weight and decreased feed costs were accompanied by improved return parameters, including total return, net return economic efficiency, and relative economic efficiency, particularly in the T2 and T3 groups. Moreover, milk yield was increased in treated groups compared with those fed basal diet. The improved milk yield was associated with the enhancement of mRNA expression of the prolactin gene and improved mammary morphological characteristics, especially in the T1 group. Indeed, a rabbit does in T2 group revealed an earlier nest building, a higher nest quality, and an increased willingness to nurse. While those in T1 group presented the highest percentages of kits with full bellies. Interestingly, T2 and T3 had large mature follicles (preovulatory follicles) and few numbers of small follicles which was associated with a marked upregulation of mRNA levels of follicular stimulating hormone gene. It would be concluded that the dietary inclusion of Berseem seeds as a complete or partial replacement for soybean in New Zealand white rabbits' diet could be used to enhance the growth performance of litter and improve doe's milk production, maternal behaviour, and economic efficiency.