Assertion-reason on dairy farm management: is "milk yield depends only on breed" really false?
Nisha Verma12th Sample
9 Oct 2026 · 1 min read
Doing a topic test on Strategies for Enhancement in Food Production and one assertion-reason has me confused. I don't want to just look at the answer key, I want to understand why.
Assertion: The milk yield of a cow depends only on the quality of its breed. Reason: Dairy cattle are selected for high yielding potential and resistance to diseases.
My answer was "both true, reason explains assertion". Key says assertion is false and the reason is true. I get that the reason is straight from NCERT, but NCERT also literally says the yield potential depends on the quality of breeds. So how is "only" wrong?
What I've revised so far for dairy: breeds like Jersey and Brown Swiss are exotic, and Sahiwal and Red Sindhi are Indian. Management points: proper housing, clean water, good feed (both quality and quantity), regular cleaning of the shed and the cattle, vet visits and records. For poultry: disease-free suitable breeds, safe housing, feed, hygiene.
I think my confusion is the word "only". Is that the whole trick? And also, are layers and broilers the same thing? My notes are mixing them up.
7 answers & replies
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[+][–]Tanvi Deshmukh12thSample· 10d ago
Yes!! The word "only" is the whole trick! 😄 NCERT says breed quality decides the potential, but then spends half the section on feed, housing, hygiene, water, vet care. A great breed on bad feed and a dirty shed won't give its potential. So "only" makes the assertion false. Reason is true, but it doesn't explain the assertion anyway.
Rule I use for assertion-reason: any "only", "always", "never" in a biology statement, be suspicious. They're usually the false part.
[+][–]Nisha Verma12thSample· 10d agoAuthor
Thanks Tanvi, ok so "only" = red flag. Going back to rework three more A-R questions from this chapter with that lens.
[+][–]Zoya Khan12thSample· 10d ago
Layers and broilers are not the same. Layers are poultry birds kept for egg production, broilers are raised for meat. NCERT just says poultry means domesticated fowl used for food or eggs, and the word includes fowl, ducks, turkey and geese, not just chickens, which surprised me when I first read it.
What helps is thinking about what each bird is being managed for. Layers need a diet and lighting that support laying, broilers need quick weight gain. In both cases, hygiene and disease control are the common management factors.
[+][–]Pooja Iyer12thSample· 10d ago
omg wait I always thought Jersey was Indian because it sounds like some Indian place 😭 someone in my class even said so in test. It's an exotic breed. So are Brown Swiss and Holstein-Friesian. The Indian ones to remember: Sahiwal and Red Sindhi. Mnemonic: "Sahi Red" = Sahiwal, Red Sindhi (Sahi means right/correct, lol)
[+][–]Nisha Verma12thSample· 10d agoAuthor
lol Pooja same, I had to double check before posting. Putting "Sahi Red" in my formula sheet.
[+][–]Rahul DubeyDropperSample· 10d ago
Note for the sake of exams: most NEET questions in this part are not tricky science, they are careful reading. Your assertion-reason is a classic example of that. Third attempt for me now and I still lose a mark or two a year to a single word like "only".
Also remember crossbreeding is done to combine good traits, for example high milk yield of one breed with disease resistance of another, so cross-bred animals are often used in dairies. It ties in with the "yield potential + resistance" line in your reason statement.
[+][–]Kavya NaikDropperSample· 10d ago
Adding one practical point from my uncle's small dairy back home. Milk handling matters too: clean, well-ventilated sheds, washing the animals, cleaning the udder and the person milking also keeping hands clean, because contamination spoils milk fast. Not every book writes this, but it fits "hygiene" and is safe to include as an example.
