शृङ्गमवस्थायां च

Operational rule vidhi

In a बहुव्रीहि समास denoting age (as well as a Name or a Resemblance), the second member शृङ्ग gets acute accent (उदात्त) on the first syllable.

Word by word (padaccheda)

Substitute / term शृङ्गम् prathamā · ekavacanaRight context अवस्थायाम् saptamī · ekavacanaIndeclinable च avyaya

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

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Full reading

शृङ्गम् अवस्थायाम् च

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

In a बहुव्रीहि समास denoting age (as well as a Name or a Resemblance), the second member शृङ्ग gets acute accent (उदात्त) on the first syllable.
Thus उद्गतशृ꣡ङ्गः, द्व्यंगुलशृ꣡ङ्गः, अंगुलशृ꣡ङ्गः ॥ Here the word शृङ्ग denotes the particular age of the cattle at which the horns come out, or become one or two inches long. Name :-ऋष्यशृ꣡ङ्गः comparison : गोशृ꣡ङ्गः, मेषशृ꣡ङ्गः ॥ Why do we say when denoting 'age &c'. Observe स्थूलशृङ्गः ॥

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.