(Jer 31:27) Behold, the days come, saith the LORD, that I will sow the house of Israel and the house of Judah with the seed of man, and with the seed of beast.
(Jer 31:28) And it shall come to pass, that like as I have watched over them, to pluck up, and to break down, and to throw down, and to destroy, and to afflict; so will I watch over them, to build, and to plant, saith the LORD.
It can't be about heaven--the rest of the verses put things in perspective. He has watched over them when they were being broken down, plucked up and destroyed--He will watch over them to build them up. He will be there so they can build up their population of both man and of animals. It doesn't say that somehow man and beast are going to be crossbreeding---the seed of man AND the seed of beast--not the seed of man with beast.
John 15 King James Version (KJV)
15 I am the true vine, and my Father is the husbandman.
2 Every branch in me that beareth not fruit he taketh away: and every branch that beareth fruit, he purgeth it, that it may bring forth more fruit.
3 Now ye are clean through the word which I have spoken unto you.
4 Abide in me, and I in you. As the branch cannot bear fruit of itself, except it abide in the vine; no more can ye, except ye abide in me.
5 I am the vine, ye are the branches: He that abideth in me, and I in him, the same bringeth forth much fruit: for without me ye can do nothing.
6 If a man abide not in me, he is cast forth as a branch, and is withered; and men gather them, and cast them into the fire, and they are burned.
And Seeds.
Mark 4 King James Version (KJV)
4 And he began again to teach by the sea side: and there was gathered unto him a great multitude, so that he entered into a ship, and sat in the sea; and the whole multitude was by the sea on the land.
2 And he taught them many things by parables, and said unto them in his doctrine,
3 Hearken; Behold, there went out a sower to sow:
4 And it came to pass, as he sowed, some fell by the way side, and the fowls of the air came and devoured it up.
5 And some fell on stony ground, where it had not much earth; and immediately it sprang up, because it had no depth of earth:
6 But when the sun was up, it was scorched; and because it had no root, it withered away.
7 And some fell among thorns, and the thorns grew up, and choked it, and it yielded no fruit.
8 And other fell on good ground, and did yield fruit that sprang up and increased; and brought forth, some thirty, and some sixty, and some an hundred.
9 And he said unto them, He that hath ears to hear, let him hear.
10 And when he was alone, they that were about him with the twelve asked of him the parable.
11 And he said unto them, Unto you it is given to know the mystery of the kingdom of God: but unto them that are without, all these things are done in parables:
12 That seeing they may see, and not perceive; and hearing they may hear, and not understand; lest at any time they should be converted, and their sins should be forgiven them.
13 And he said unto them, Know ye not this parable? and how then will ye know all parables?
14 The sower soweth the word.
15 And these are they by the way side, where the word is sown; but when they have heard, Satan cometh immediately, and taketh away the word that was sown in their hearts.
16 And these are they likewise which are sown on stony ground; who, when they have heard the word, immediately receive it with gladness;
17 And have no root in themselves, and so endure but for a time: afterward, when affliction or persecution ariseth for the word's sake, immediately they are offended.
18 And these are they which are sown among thorns; such as hear the word,
19 And the cares of this world, and the deceitfulness of riches, and the lusts of other things entering in, choke the word, and it becometh unfruitful.
20 And these are they which are sown on good ground; such as hear the word, and receive it, and bring forth fruit, some thirtyfold, some sixty, and some an hundred.
21 And he said unto them, Is a candle brought to be put under a bushel, or under a bed? and not to be set on a candlestick?
22 For there is nothing hid, which shall not be manifested; neither was any thing kept secret, but that it should come abroad.
23 If any man have ears to hear, let him hear.
24 And he said unto them, Take heed what ye hear: with what measure ye mete, it shall be measured to you: and unto you that hear shall more be given.