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"Ordeña" is a noun which is often translated as "milking", and "primero" is an adjective which is often translated as "first". Learn more about the difference between "ordeña" and "primero" below.
la ordeña()
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
a. milking
Durante la ordeña de las vacas se extraen miles de litros de leche.Thousands of liters of milk are extracted during the milking of the cows.
primero()
An adjective is a word that describes a noun (e.g., the big dog).
1. (position)
a. first
Luis fue el primer invitado en llegar a la fiesta.Luis was the first guest to arrive at the party.
2. (in time)
3. (principal)
An adverb is a word that describes a verb, an adjective, or other adverbs (e.g., to run quickly, very tired).
This means that the noun can be masculine or feminine, depending on the gender of the noun it refers to (e.g., el doctor, la doctora).
a. the best
Era el primero en matemáticas en séptimo grado.I was the best in mathematics in seventh grade.