A full list of what gives Mastery Points and how much you can expect to get from each action...
Sheep

Sheep (Basic, Black, Grey), Badrap Sheep, Kissing Sheep, Big Horn Sheep
Tend Adult - 1 Point
Tend Adult on Neighbour's Homestead - 3 Points
Sell Adult - 3 Points

Mouflon Sheep
Tend Adult - 2 Point
Tend Adult on Neighbour's Homestead - 6 Points
Sell Adult - 6 Points
Neighbour Visit Tend - 2 Point

Tend Adult - 5 Point
Tend Adult on Neighbour's Homestead - 10 Points
Sell Adult - 10 Points
Neighbour Visit Tend - 5 Point
Cow

Cow, Highland Cows (all colours), Badrap Cow, Black Cow, Jersey Cow, Swiss Cow, Kobe Cow, Bridal Cow
Tend Adult - 1 Point

Sell Adult - 3 Points
Neighbour Visit Tend - 1 Point
Belted Cow
Tend Adult - 2 Point
Tend Adult on Neighbour's Homestead - 6 Points
Sell Adult - 6 Points

Holstein Cow
Tend Adult - 5 Point
Tend Adult on Neighbour's Homestead - 10 Points
Sell Adult - 10 Points
Neighbour Visit Tend - 5 Point
Pig

Pig, Black Pig, Party Pig, Tracking Pig, White Pig, Tuxedo Pig
Tend Adult - 1 Point
Tend Adult on Neighbour's Homestead - 3 Points

Neighbour Visit Tend - 1 Point
Spotted Pig
Tend Adult - 2 Point
Tend Adult on Neighbour's Homestead - 6 Points
Sell Adult - 6 Points
Neighbour Visit Tend - 2 Point

Giant Hog
Tend Adult - 5 Point
Tend Adult on Neighbour's Homestead - 10 Points
Sell Adult - 10 Points
Neighbour Visit Tend - 5 Point
Chicken

Chicken, Queasy Chicken, Spiffy Chicken, Dr Cluck
Tend Adult - 1 Point
Tend Adult on Neighbour's Homestead - 3 Points
Sell Adult - 3 Points

Rhode Island Red
Tend Adult - 2 Point
Tend Adult on Neighbour's Homestead - 6 Points
Sell Adult - 6 Points
Neighbour Visit Tend - 2 Point

Spotted Chicken
Tend Adult - 5 Point
Tend Adult on Neighbour's Homestead - 10 Points
Sell Adult - 10 Points
Neighbour Visit Tend - 5 Point
Moose

Moose
Tend Adult - 1 Point
Tend Adult on Neighbour's Homestead - 3 Points

Neighbour Visit Tend - 1 Point
Black Moose
Tend Adult - 2 Point
Tend Adult on Neighbour's Homestead - 6 Points
Sell Adult - 6 Points
Neighbour Visit Tend - 2 Point

Red Moose
Tend Adult - 5 Point
Tend Adult on Neighbour's Homestead - 10 Points
Sell Adult - 10 Points
Neighbour Visit Tend - 5 Point
Badger

Badger
Tend Adult - 1 Point
Tend Adult on Neighbour's Homestead - 3 Points

Neighbour Visit Tend - 1 Point
Badger Gold
Tend Adult - 2 Point
Tend Adult on Neighbour's Homestead - 6 Points
Sell Adult - 6 Points
Neighbour Visit Tend - 2 Point

Honey Badger
Tend Adult - 5 Point
Tend Adult on Neighbour's Homestead - 10 Points
Sell Adult - 10 Points
Neighbour Visit Tend - 5 Point