B.Sc Zoology

After completing M.Sc in dietetics and food services, specifically in the government sector, you could consider working in the Department of Health, Department of Agriculture, Food and Drug Administration, Ministry of Child and Women Welfare to name a few options. Most of these government departments post their job requirements on their websites and through the national dailies. We would recommend that once your course is completed, you search through the websites of these departments for the opportunities available at that point in time and apply for the same accordingly. Your selection, of course, will depend upon how you perform in the selection process. Other than the government departments, you could also consider working with food manufacturers, drug and healthcare companies, hospitals, freezing plants, breweries, as a lecturer, medical centres and restaurant chains, etc. The minimum eligibility for any PG level course is graduation. Some additional eligibility criteria include: B.Sc (Hom Science) with specialization in Foods and Nutrition, PG Diploma in Dietetics and Public Health Nutrition (PDPHN) or its equivalent, a graduate or an equivalent course from the backgrounds like science, healthcare, medical, pharmaceutical and catering along with either the Diploma in Nutrition and Health Education Degree (DNHE), Certificate in Nutrition and Child Care (CNCC) or Certificate in Foods and Nutrition offered by IGNOU.

It's your choice to choose MBA or M.Sc (Zoology). As an academic / career expert, I can explore you about the scope and employment opportunities of both.
MBA is PG program in Management which deals various subjects of Management, Accountancy, Business Laws, Business Ethics, Organizational Behavior and Communication, Business Maths and Statistics, etc. You can specialize either in traditional branches / electives (Finance, HR, Marketing and Systems) or can choose Sectoral programs like Hospital Management, Healthcare Administration, Project Management , Logistics and Supply Chain Management, etc.
MBA is a gateway into corporate world. With an MBA, you can touch the top most position (If you have right attitude, ability, skills, leadership qualities, etc.). There is no limit for salary in corporate world. You can draw monthly salary in lakhs and there is not any specific retirement age.
Of course M.Sc in Zoology is also a good option. Teaching is the prime employment area after M.Sc-Zoology. You have to continue your studies and have to complete M.Phil / PhD to get job as Lecturer in Colleges. Also, you need to clear tests such as NET (for teaching positions at colleges) and SET (For teaching positions in Higher Secondary / HSc).
M.Sc + BEd + SET is the required qualification for HSc / Plus Two / Senior Secondary teachers.
Now a days UGC offers attractive Salary Package for college lecturers.
Now it's your decision, Think about both careers and take right decision.