Here are a few options for the WordPress post tag description, ranging from simple to slightly more detailed, along with explanations:

**Option 1 (Simple & Direct):**

* Traditional Chinese: **關於動物的營養學知識與應用。** (Guān yú dòng wù de yíng yǎng xué zhī shì yǔ yìng yòng.)
* English Translation: Animal nutrition knowledge and its application.
* Explanation: This is concise and immediately clear. It covers the core topic.

**Option 2 (Slightly More Descriptive):**

* Traditional Chinese: **分享關於寵物、家畜等動物的飲食、營養素、食物配方，以及營養對動物健康的影響。** (Fēn xiǎng guān yú chǒng wù, jiā chù děng dòng wù de yǐn shí, yíng yǎng sù, shí wù pèi fāng, yǐ jí yíng yǎng duì dòng wù jiàn kāng de yǐng xiǎng.)
* English Translation: Sharing information about pet, livestock, and other animal’s diets, nutrients, food formulas, and the influence of nutrition on animal health.
* Explanation: This expands on the core topic and hints at specific content types that might be found with the tag, such as recipes, ingredient information, and health effects.

**Option 3 (Focus on Practical Information):**

* Traditional Chinese: **提供動物營養方面的實用資訊，包括餵養建議、營養補充劑、疾病預防，以及如何為您的動物選擇最佳飲食。** (Tí gòng dòng wù yíng yǎng fāngmiàn de shíyòng zīxùn, bāokuò wèi yǎng jiànyì, yíngyǎng bǔchōngjì, jíbìng yùfáng, yǐjí rúhé wèi nín de dòngwù xuǎnzé zuì jiā yǐnshí.)
* English Translation: Providing practical information on animal nutrition, including feeding recommendations, nutritional supplements, disease prevention, and how to choose the best diet for your animals.
* Explanation: This focuses on practical applications and promises actionable advice and guidance to the user.

**Option 4 (Comprehensive, for broader audiences):**

* Traditional Chinese: **深入探討各種動物的營養需求，涵蓋從寵物到牲畜，以及不同生命階段及健康狀況下的飲食考量。包含食物選擇、營養素分析、疾病管理與飲食相關性等。** (Shēn rù tàn tǎo gè zhǒng dòng wù de yíng yǎng xūqiú, hángài cóng chǒngwù dào shēngchù, yǐjí bùtóng shēngmìng jiēduàn jí jiànkāng zhuàngkàng xià de yǐnshí kǎolǜ. Bāohán shíwù xuǎnzé, yíngyǎng sù fēnxī, jíbìng guǎnlǐ yǔ yǐnshí xiāngguān xìng děng.)
* English Translation: In-depth exploration of the nutritional needs of various animals, covering pets to livestock, and dietary considerations for different life stages and health conditions. Including food choices, nutrient analysis, disease management and diet-related issues.
* Explanation: This option is quite detailed, aiming to reassure different users that the tag covers a wide range of animal nutrition-related topics.

**How to Choose:**

* **Audience:** Who are you writing for? Pet owners? Farmers? Vets? A broad audience?
* **Coverage:** What type of content will you be tagging with “動物營養”?
* **Keyword Strategy:** Do you want to include specific keywords that users might search for?

The best description will be the one that accurately reflects your content and attracts the target audience and is clear and informative. Choose the option that best aligns with these considerations. I would personally suggest option 2 or 3 for general use.